ASSP M664SP/FP M664SP/FP 6-DIGIT 5X7-SEGMENT FD CONTROLLER 6-DIGIT 5 7-SEGMENT FD CONTROLLER DESCRIPTION The M664 is a 6-digit 5 7-segment vacuum fluorescent display (FD) controller using the silicon gate CMOS technology. It contains 6 ROM characters and 6 user-defined RAM characters and receives display character codes and various commands from MCU to control FD. FEATURES Built in 5 7-dot segment character ROM (6 characters based on JIS-C-622. Customization is possible.) Built in character RAM for user definition (6 characters) Display digit length can be changed. (from 9 to 6 digits) One-digit display cycle setting can be changed. (2 cycles) Dimmer is adjustable. (8 grades) Cursor display ON or OFF is selectable. (SEG35 output) Built in automatic display digit increment function Auto increment of display digit Built in simultaneous all-digit display ON/OFF command Connection to MCU by three signal lines, CS, and SDATA Instruction execution with one byte 2 general purpose output ports Positive supply voltage CC=5 ± % Pull-down voltage P=CC-4 typ. CC-45 max. (peak) : Except for character RAM setting APPLICATION A equipments, vacuum fluorescent display controller for POS system, etc. FUNCTION The M664 is a 6-digit 5 7-segment FD (acuum Fluorescent Display) controller and contains 6 ROM characters based on JIS-C-622 which can be customized and 6 RAM characters that user can define freely. Character display codes and various commands are received as 8-bit serial data from MCU. Main functions of this IC are display digit length setting, onedigit display cycle setting and dimmer adjustment. It has 36 segment output pins from SEG to SEG35 and uses 35 pins from SEG to SEG34 for character display. SEG35 output, which is independent of other segment, is used for cursor display by inputting either cursor ON or OFF command. Once display data is fixed, display continues automatically until new data is input. Therefore, MCU can execute other jobs and is lightened of its load. Additionally, the IC can control other I/O elements because it contains two static operation output ports. Digit outputs DIG DIG 2 DIG9 3 DIG8 4 DIG7 5 DIG6 6 DIG5 7 DIG4 8 DIG3 9 DIG2 DIG DIG 2 Reset input RESET 3 Chip select input Shift clock input CS 4 CSK 5 Serial data input SDATA 6 Output ports Clock output Clock input P 7 P 8 CC 9 XOUT 2 XIN 2 SS 22 SEG35 23 SEG34 24 SEG33 25 SEG32 26 Segment outputs SEG3 27 SEG3 28 SEG29 29 SEG28 3 SEG27 3 P 32 M664SP/FP Outline 64P4B 64P2G-A 64 DIG2 63 DIG3 Digit output 62 DIG4 6 DIG5 6 CC2 59 SEG 58 SEG 57 SEG2 56 SEG3 55 SEG4 54 SEG5 53 SEG6 52 SEG7 5 SEG8 5 SEG9 49 SEG 48 SEG 47 SEG2 Segment outputs 46 SEG3 45 SEG4 44 SEG5 43 SEG6 42 SEG7 4 SEG8 4 SEG9 39 SEG2 38 SEG2 37 SEG22 36 SEG23 35 SEG24 34 SEG25 33 SEG26
M664SP/FP 6-DIGIT 5 7-SEGMENT FD CONTROLLER BLOCK DIAGRAM Display code register (8-bit 6) Decoder CGROM (35-bit 6) 59 SEG Chip select input Shift clock input Serial data input CS 4 5 SDATA 6 Serial receive circuit code write Code / command control circuit RAM write Decoder CGRAM (35-bit 6) Segment output circuit 33 SEG26 3 SEG27 23 SEG35 Segment outputs Output port (2 bits) 8 7 P P Output ports Reset input RESET 3 Display control register code select 2 DIG Clock input Clock output XIN XOUT 2 2 Clock generator Display controller Digit output circuit DIG 64 DIG2 6 DIG5 Digit outputs OPERATION FLOW The serial receive circuit receives 8-bit serial data, latches the data by an internal latch signal, and then masks inputs from the MCU. When the code/command circuit receives a command, it sets the display control register to the fixed state, and when it receives a character code, it writes the code to one of 6 display code registers which corresponds to the digit to display. The display controller outputs digit ON/OFF timing pulse to the digit output circuit and selects one character code to display among display code registers. The selected character code is input to either CGROM decoder or CGRAM decoder and then converted into a 35-bit character pattern to input the segment output circuit. 2
M664SP/FP 6-DIGIT 5X7-SEGMENT FD CONTROLLER PIN DESCRIPTIONS Symbol RESET CS SDATA XIN, XOUT DIG~ DIG5 SEG~ SEG35 P, P CC CC2 SS P Pin name Reset input Chip select input Shift clock input Serial data input Clock input Clock output Digit output Segment output Function This pin is used to initialize the internal state of the M664. In L state, communication with the MCU is possible. In H state, any instruction from the MCU is neglected. At the rising edge from L to H, input data is shifted. Character code or command data to display is input from MSB. This pin is used to connect a resistor and a capacitor externally to set oscillation frequency. (maximum oscillation frequency fosc(max)=mhz) An external clock can be also connected. In this case, an external clock is connected to pin XIN, and pin XOUT is set to be in open state. These pins are used to connect to digit pins of FD. Pins from DIG to DIG5 correspond to digits of FD from the first digit to the 6th digit. These pins are used to connect to segment pins of FD. Pins from SEG to SEG35 correspond to segment pins of FD as shown in the table below. Output port (static operation) Positive power supply for internal logic Positive power supply for high-pressure-resistant output port GND Negative power supply for FD drive (Connection of segment output pins) Each in the table shows one-dot segment and each figure in shows the output segment pin number (from to 35) to connect. 2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9 2 2 22 23 24 25 26 27 28 29 3 3 32 33 34 35 3
M664SP/FP 6-DIGIT 5 7-SEGMENT FD CONTROLLER DATA TRANSMISSION FORMAT The MCU transmits 8-bit serial data (MSB-first) to the M664. In either case of command data or character code data, the M664 operates by transmitting only one-byte data. However, in case of character RAM data setting, it is necessary to send 7-byte data continuously. (Transmission timing) Standard timing CS SDATA D7 D6 (MSB) D5 D4 D D (LSB) Continuous data transmission timing (In the following example, command data is transmitted and then character codes are transmitted continuously.) CS tbusy tbusy SDATA Command data Character code Character code tbusy: Internal processing time 4
M664SP/FP 6-DIGIT 5X7-SEGMENT FD CONTROLLER COMMAND LIST Function D7 D6 D5 Command code D4 D3 D2 D D Contents Display digit length setting The number of digits to display is fixed. Eight types of setting (from 9 digits to 6 digits) are possible. Dimmer value setting Eight types of setting (from /6 to 4/6) are possible for dimmer value. One-digit display frequency setting Either 28/fOSC or 256/fOSC is selected as onedigit display frequency. Display digit setting The first character code received after executing this command is displayed as designated by this command. Auto increment setting This command is executed to set or cancel the automatic display digit increment function. Cursor ON This command is executed to make SEG35 ON. Cursor OFF This command is executed to make SEG35 OFF. All digit display ON/OFF This command is executed to make all-digit display OFF or all-digit/segment display ON. Write to user RAM Character data is written into RAM for user definition. Output port state setting Output ports P and P are set or reset. : Optional : Refer to the description of command. DESCRIPTION OF COMMAND. Display digit length setting D7 D6 D5 D4 D3 D2 D D Display digit length (See table.) Table Display digit length D2 D D Display digit length 9 2 3 4 5 6 5
M664SP/FP 6-DIGIT 5 7-SEGMENT FD CONTROLLER 2. Setting of dimmer value and one-digit display frequency(tdsp) ) Dimmer value setting D7 D6 D5 D4 D3 D2 D D Dimmer value (See table 2.) 2) One-digit display frequency (Tdsp) setting D7 D6 D5 D4 D3 D2 D D Table 2 Dimmer value D2 D D Tdig : One-digit-ON pulse width Tdsp: One-digit display frequency 4. All-digit display ON/OFF Dimmer value (Tdig/Tdsp) /6 2/6 4/6 6/6 8/6 /6 2/6 4/6 D7 D6 D5 D4 D3 D2 D D One-digit display frequency (Tdsp) : Tdsp=28/fOSC : Tdsp=256/fOSC 3. Display digit setting, setting and cancel of auto increment ) Display digit setting D7 D6 D5 D4 D3 D2 D D Table 3 ON/OFF control D D : Don t care Operation All-digit display OFF (All-OFF) Normal operation mode setting All-digit/segment display ON (All-ON) 5. Cursor OFF (SEG35 output OFF) See table 3. D7 D6 D5 D4 D3 D2 D D Display digit (Note ) 2) Setting and cancel of auto increment D7 D6 D5 D4 D3 D2 D D Digit setting (Note 2) Setting and cancel of auto increment : Setting of auto increment : Cancel of auto increment 6. Cursor ON (SEG35 output ON) D7 D6 D5 D4 D3 D2 D D Note : When the display digit is defined as N, N equals [decimal values to which D3, D2, D and D are converted + ]. In case of (D3, D2, D, D)=(,,, ), N is 9. The first character code received after executing this command is despoiled to the 9th digit. Digit setting (Note 2) Note 2: The digit to which the cursor to make display ON or OFF belongs is designated. When digit is defined as N, N equals [decimal values to which D3, D2, D and D are converted + ]. In case of (D3, D2, D, D)=(,,, ), N is 9. ON/OFF control of the cursor which belongs to the 9th digit is possible. 6
M664SP/FP 6-DIGIT 5X7-SEGMENT FD CONTROLLER 7. Write to character RAM for user definition Segment ON/OFF data is written into the character RAM for user definition (35 bits). After write to RAM is declared at the first byte, RAM is selected at the second byte and ON/OFF data is transmitted at the 3rd to 7th byte. Therefore, write to RAM is executed by a 7-byte command. Character codes from RAM to RAM 6 are assigned to data from 96 to 9F6 respectively. st column 3rd column 5th column 2 3 4 5 6 7 8 9 2 3 4 D7 D6 D5 D4 D3 D2 D D 5 6 7 8 9 st byte (Declaration of write to RAM) : Don t care D7 D6 D5 D4 D3 D2 D D 2 2 22 23 24 25 26 27 28 29 3 3 32 33 34 2nd byte (Selection of RAM) 2nd column 4th column (Segment number) RAM selection RAM : (D3, D2, D, D) = (,,, ) ~ ~ ~ RAM 6: (D3, D2, D, D) = (,,, ) : Don t care Ex. In order to define F (see the figure) as character RAM, 7-byte data as shown in the following table should be transmitted in serial order. D7 D6 D5 D4 D3 D2 D D 3rd byte (Data in st column) 5 5 2 25 3 4th byte (Data in 2nd column) 5th byte (Data in 3rd column) 6th byte (Data in 4th column) 7th byte (Data in 5th column) 6 6 2 26 3 2 7 2 7 22 27 32 3 8 3 8 23 28 33 4 9 4 9 24 29 34 : corresponding segment OFF : corresponding segment ON 2 3 4 5 6 7 Transmission data FC6 6 FE6 96 96 96 86 Remarks Declaration of write to RAM Selection of RAM Setting of st-column segment data Setting of 2nd-column segment data Setting of 3rd-column segment data Setting of 4th-column segment data Setting of 5th-column segment data All optional bits are set to. 8. Output port setting D7 D6 D5 D4 D3 D2 D D Set ( H ): Reset ( L ): P set/reset P set/reset 7
M664SP/FP 6-DIGIT 5 7-SEGMENT FD CONTROLLER DESCRIPTION OF FUNCTION. Display digit length setting The display digit length can be set within the range from 9- digit to 6-digit according to the number of digits of FD. In case that the display digit length is set to 2 when a 6- digit FD is used, digits from 3 to 6 are displayed as blank. 2. Dimmer value and one-digit display frequency (Tdsp) setting Regarding dimmer value, 8-stage setting is possible. Onedigit display scan time (Tdsp) can be set to either Tdsp=28/ fosc or Tdsp=256/fOSC. Scan cycle time T is set to T=Tdsp N (N: display digit length). Ex. fosc=455khz, N=6 Tdsp=28µs, T=4.5ms (222Hz) or Tdsp=562µs, T=9.ms (Hz) DISPLAY TIMING T Tdsp Digit N (Most significant digit) Tblk Digit N- Tdig Digit N-2 Digit (Least significant digit) T: Scan cycle time Tdig: One-digit-ON pulse width Tdsp: One-digit scan time Tblk : Blanking time 8
M664SP/FP 6-DIGIT 5X7-SEGMENT FD CONTROLLER 3. Character display A character (refer to the character code table) which corresponds to the character code transmitted from the MCU is displayed as the designated digit. The display digit is designated by the display digit setting command. In case that the display digit designated by this command is set to increase automatically, the display digit is automatically increased by. After a character is displayed to the most significant digit, it is displayed to the least significant digit. When the auto increment setting is canceled, the display digit is fixed. Ex. In order to display a character A to digits 4, 5, 6, and 2 in this order and characters A, B and C to digit 8 successively, 2-byte data must be transmitted in the following order. (Display digit length = 6) A (code 46) B (code 426) C (code 436) OPERATION AT RESET When a reset signal is input, the internal state is initialized as shown in Table 4. Table 4 Initial state Contents Display (characters and cursor) Display digit length, dimmer value, display digit, one-digit display frequency, user character RAM state, auto increment setting Serial receive circuit Output port setting Setting after reset All digits: OFF alues immediately before reset are held. Reset Set 2 3 4 5 6 7 8 9 Transmission data F56 ED6 46 46 46 46 46 F46 E76 Display digit 4 5 6 2 Remarks Setting of auto increment Display digit is set to the 4th digit. Transmission of character code Cancel of auto increment setting Display digit is set to the 8th digit. 2 46 426 436 8 8 8 Transmission of character code 4. All-digit display ON/OFF All digits are simultaneously lighted or put off by inputting alldigit display ON command or all-digit display OFF command. When all-digit display ON command is transmitted, all digits including a cursor and all segments are lighted. Therefore, this command can be used for the lamp test. When all-digit display ON setting is canceled (normal operation mode is selected), all digits are displayed according to the setting before all-digit display ON operation. It is also possible to set the next character to the designated digit during the all-digit display ON operation. When all-digit display OFF command is transmitted, all digits including a cursor are put off. When all-digit display OFF setting is canceled (normal operation mode is selected), all digits are displayed according to the setting before all-digit display OFF operation. It is also possible to set the next character to the designated digit in the all-digit display OFF state. 9
M664SP/FP 6-DIGIT 5 7-SEGMENT FD CONTROLLER ABSOLUTE MAXIMUM RATINGS Symbol CC P I O Pd Parameter Supply voltage Pull-down voltage Input voltage Output voltage Maximum power dissipation CC, CC2 XOUT, P, P SP (Note 3) Conditions Any external circuits are not connected to the IC. Ta=25 C (Note 4) Ratings.3 ~ + 7 CC 45 ~ CC +.3.3 ~ CC +.3.3 ~ CC +.3.6 Unit W FP The IC is mounted on a board. Ta=25 C (Note 5).4 Tstg Storage temperature 65 ~ 5 C Notes 3: Frequency of pulse waveform exceeding CC-4:45µs or above, pulse width: 3µs or below, output load: CL 2pF 4: When Ta is 25 C or above, derating (2.8mW/ C) should be conducted. 5: When Ta is 25 C or above, derating (.2mW/ C) should be conducted. RECOMMENDED OPERATIONAL CONDITIONS (Ta= ~ 7 C unless otherwise noted) Symbol CC P SS I Topr Parameter Supply voltage Pull-down voltage Supply voltage Input voltage Operating temperature CC, CC2 Conditions Min. 4.5 CC 4 Limits Typ. 5 Max. 5.5 CC CC 7 Unit C DC CHARACTERISTICS (Ta = ~ 7 C, CC = 5 ± %, SS = ) Symbol Parameter Conditions Min. Limits Typ. Max. Unit IH IL T+ T IIH IIL OH OL IO ICC IP (Note 6) H input voltage L input voltage Positive direction threshold voltage Negative direction threshold voltage H input current L input current H output voltage L output voltage Output pull-down current Positive supply current Negative supply current SDATA RESET CS, XIN DIG output SEG output P, P P, P DIG, SEG CC, CC2 P I=CC I= IOH= 2mA IOH= 5mA IOH= 2mA IOL=2mA P=CC 4, O=CC I=, Output pin: open P=CC 4 Output pin: open Output H, clock stop P=CC 4 Output pin: open Output H, clock stop P=CC 4.7CC.35CC.2CC CC 2 CC 2 CC.8 25 2.8 2 5.3CC.7CC.55CC.55 85 4 4 µa µa µa µa ma ma Note 6: Total of current at pin CC and current at pin CC2.
M664SP/FP 6-DIGIT 5X7-SEGMENT FD CONTROLLER TIMING CONDITIONS (Ta = ~ 7 C, CC = 5 ± %, SS = ) tc twh twl Symbol tsu(d) th(d) tsu(cs) th(cs) tbusy (Note 7) Clock cycle time Parameter Clock cycle pulse width Clock low pulse width SDATA setup time SDATA hold time CS setup time CS hold time Internal processing time XIN XIN XIN Conditions Min. 5 23 46 23 46 3 3 Limits Typ. Max. 6 Unit ns ns ns ns ns ns ns /fosc Note 7: This shows the internal operation time after receiving the serial data. Next data is prohibited in this period. Next data is available after 6T of the operation clock. OSCILLATION CHARACTERISTICS (Ta = ~ 7 C, CC = 5 ± %, SS = ) Symbol fosc Parameter Oscillation frequency Conditions C=pF, R=27kΩ Min. Limits Typ. 5 Max. Unit khz TIMING WAEFORM (Reference voltage:.3cc,.7cc) CS tc tsu(cs) twl twh th(cs) tsu(d) th(d) SDATA tbusy nth byte (n+)th byte
M664SP/FP 6-DIGIT 5 7-SEGMENT FD CONTROLLER OPERATION FLOWCHART (Initial setting operation) START PUT OFF ALL- DIGIT DISPLAY SET DISPLAY DIGIT LENGTH SET DIMMER ALUE AND ONE-DIGIT DISPLAY FREQUENCY TRANSMIT RAM WRITE COMMAND TRANSMIT RAM BIT DATA NO BIT DATA TRANSMISSION COMPLETED YES NO WRITE TO RAM COMPLETED YES SET AUTO INCREMENT, SET DISPLAY DIGIT TRANSMIT DISPLAY CHARACTER CODE NO TRANSMISSION OF ALL DIGITS COMPLETED YES SET TO NORMAL OPERATION MODE END 2
M664SP/FP 6-DIGIT 5X7-SEGMENT FD CONTROLLER CHARACTER CODE LIST (conforming to JIS-C-622) Lower codes Upper codes (6) (6) (26) (36) (46) (56) (66) (76) (86) (96) (A6) (B6) (C6) (D6) (E6) (F6) (6) SPASE RAM SPASE (6) RAM2 (26) RAM3 (36) RAM4 (46) RAM5 (56) RAM6 (66) RAM7 (76) RAM8 (86) RAM9 (96) RAM (A6) RAM (B6) RAM2 (C6) RAM3 (D6) RAM4 (E6) RAM5 (F6) RAM6 Note: Character codes which can be defined by users are 6 codes from 26 to 7F6 and from A6 to DF6. Codes except those from 26 to 7F6 and from 96 to DF6 are command codes. 3
M664SP/FP 6-DIGIT 5 7-SEGMENT FD CONTROLLER APPLICATION EXAMPLE FD Heater Heater transformer +5 Power on reset ANODE (SEGMENT) GRID (DIGIT) CC RESET CC SEG DIG ~ SEG35 ~DIG5 MCU SS Serial bus CS SDATA M664SP/FP SS XIN XOUT CR oscillator P 35 Cutoff bias voltage 4