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STM86312
1/4 to 1/11-duty VFD controller/driver
General features
Many display modes (11 segments & 11 digits to 16 segments & 4 digits) Key scanning (6 x 4 matrix) Dimming circuit (eight steps) High-voltage output (VDD - 35V max) LED ports (4 chs, 20mA max) General purpose input port (4 bits) No external resistor necessary for driver output (P-channel open drain + pull down resistor output) Serial interface (CLK, STB, DIN, DOUT)
PQFP44

Description
The STM86312 is a VFD (Vacuum Fluorescent Display) controller/driver that is driven on a 1/4 to 1/11-duty factor. It consists of 11-segments output lines, 6 grid output lines, 5 segments/grid output drive lines, a display memory, a control circuit, and a key scan circuit. Serial data are input to the STM86312 through a three-line serial interface. This VFD controller/driver is ideal as a peripheral device for a single-chip microcomputer.
Order codes
Part number STM86312 Temperature range -40 to 85 C Package PQFP44 Tube Tray
March 2006
Rev 2
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Contents
STM86312
Contents
1 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 2.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 5 6 7 8
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Display RAM address and display mode . . . . . . . . . . . . . . . . . . . . . . . 10 LED port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 SW data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8.1 8.2 8.3 8.4 Display mode setting command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Data setting command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Address setting command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Display control command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9 10 11 12
Serial communication format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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STM86312
Block diagram
1
Block diagram
Figure 1. Block diagram
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Pin settings
STM86312
2
2.1
Pin settings
Pin connection
Figure 2. Pin connection
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STM86312
Pin settings
2.2
Pin description
Table 1. Pin description
Pin N 1, 2, 3, 4 5 6 8 Symbol SW1, SW2, SW3, SW4 DOUT DIN CLK Name and function General-purpose switch inputs. Output serial data at falling edge of the shift clock, starting from lower bit. This is N-ch open-drain output pin. Input serial data at rising edge of the shift clock, starting from lower bit. Reads serial data at rising edge, and outputs data at falling edge. Initializes serial interface at rising or falling edge to make STM86312 waiting for reception of command. Data input after STB has fallen are processed as a command. While command data are processed, current processing is stopped, and the serial interface is initialized. While STB is high, CLK is ignored. Input data to these pins are latched at end of the display cycle. 5V 10%. Segment output pins (Dual function as key source). Segment output pins.
9
STB
10, 11, 12, 13 14, 38 15, 16, 17, 18, 19, 20 21, 22, 23, 24, 25 26, 28, 29, 30, 31 32, 33, 34, 35, 36, 37 39, 40, 41, 42 7, 43 27 44
KEY1, KEY2, KEY3, KEY4 VDD SEG1/KS1 to SEG6/KS6 SEG7 to SEG11
SEG12/GRID11 to These pins are selectable for segment or grid driving. SEG16/GRID7 GRID1 to GRID6 Grid output pins. LED1 to LED4 VSS VEE OSC CMOS outputs. +20 mA max. Connect this pin to system GND. Pull-down level. V DD - 35V max. Connect to an external resistor.
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Maximum rating
STM86312
3
Maximum rating
Stressing the device above the rating listed in the "Absolute Maximum Ratings" table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Table 2. Absolute maximum ratings
Symbol VDD VEE VI VO2 IO1 IO2 TA Logic Supply Voltage Driver Supply Voltage Logic Input Voltage VFD Driver Output Voltage LED Driver Output Current VFD Driver Output Current -15 (Segment) Operating Ambient Temperature -40 to 85 C Parameter Value -0.5 to 7 VDD+0.5 to VDD-40 -0.5 to V DD+0.5 VEE-0.5 to VDD +0.5 25 -40 (Grid) mA Unit V V V V mA
3.1
Thermal data
Table 3. Thermal data
Symbol
RthJC
Parameter Thermal Resistance Junction-case
Value 56
Unit C/W
3.2
Recommended operating conditions
Table 4. Recommended operating conditions
Symbol VDD VIH VIL VEE Parameter Logic Supply Voltage High Level Input Voltage Low Level Input Voltage Driver Supply Voltage Min 4.5 0.7xVDD 0 0 Typ 5 Max 5.5 VDD 0.3xVDD VDD-35 Unit V V V V
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STM86312
Maximum rating Maximum power consumption PMAX = VFD driver dissipation + RL dissipation + LED driver dissipation + dynamic power consumption. Where segment current = 3 mA, grid current = 15 mA, and LED current = 20 mA, VFD driver dissipation = number of segments x 6 + number of grids/(number of grids + 1) x 30 (mW) RL dissipation = (VDD - VEE)2/50 x (segment + 1) (mW) LED driver dissipation = number of LEDs x 20 (mW) Dynamic power consumption = VDD x 5 (mW)
Example
Where VEE = -25 V, VDD = 5 V, and in 16-segment and 6-digit modes, VFD driver dissipation = 16 x 6 + 6/7 x 30 = 122 RL dissipation = 302/50 x 17 = 306 LED driver dissipation = 4 x 20 = 80 Dynamic power consumption = 5 x 5 = 25 Total 553 mW.
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Electrical characteristics
STM86312
4
Electrical characteristics
Table 5. Electrical characteristics (VDD = 4.5 to 5.5V, VSS = 0V, V EE = VDD - 35V, TA = -20 to 70C, unless otherwise noted. Typical values are at TA = 25C)
Value Symbol VOH1 VOL1 VOL2 IOH21 IOH22 Parameter Test Conditions Min. High Level Output Voltage LED1-LED4, IOH1=-1mA Low Level Output Voltage LED1-LED4, IOL1=20mA Low Level Output Voltage DOUT, IOL2 = 4mA High Level Output Current VO = VDD - 2V, Seg1 to Seg11 High Level Output Current VO = VDD - 2V, Grid1 to Grid6, Seg12/Grid11 to Seg16/Grid7 Driver Leakage Current Output Pull-Down Resistor Input Current High Level Input Voltage Low Level Input Voltage Hysteresis Voltage Dynamic Current Consumption CLK, D IN, STB Under no load, display off 0.35 5 VO = VDD - 35V, driver off Driver Output VI = VDD or VSS 0.7VDD 0.3VDD 50 100 -3 -15 0.9VDD 1 0.4 Typ. Max. V V V mA mA Unit
IOLEAK RL II VIH VIL VHYS IDDdyn
-10 150 1
A k A V V V mA
Table 6. Switching characteristics (VDD = 4.5 to 5.5V, VSS = 0V, VEE = VDD - 35V, TA = -20 to 70C, unless otherwise noted. Typical values are at TA = 25C)
Value Symbol tPLZ tPZL tTZH1 tTZH2 Rise Time Parameter Propagation Delay Test Conditions Min. CLK DOUT RL = 10 k, C L = 15 pF CL = 300 Seg1 to Seg11 pF Grid1 to Grid6, Seg12/Grid11 to Seg16/Grid7 CL = 300 pF, Segn, Gridn Duty = 50% 1 15 Typ. Max. 300 100 2 0.5 s ns Unit
tTHZ fMAX CI
Fall Time Maximum Clock Frequency Input Capacitance
120
s MHz pF
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STM86312
Electrical characteristics Table 7. Timing Characteristics (VDD = 4.5 to 5.5V, TA = -20 to 70C, unless otherwise noted. Typical values are at TA = 25C)
Value Symbol PWCLK PWSTB tSETUP tHOLD Parameter Clock Pulse Width Strobe Pulse Width Data Setup Time Data Hold Time CLK STB CLK CLK Test Conditions Min. 400 1 100 100 1 1 Typ. Max. ns s ns ns s s Unit
tCLK-STB Clock-Strobe Time tWAIT Wait Time (Note 1)
Note:
Refer to page Serial Communication Format.
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Display RAM address and display mode
STM86312
5
Display RAM address and display mode
The display RAM stores the data transmitted from an external device to the STM86312 through the serial interface; addresses are as follows, in 8-bits unit: RAM stores addresses
Seg1 00 HL 02 HL 04 HL 06 HL 08 HL 0A H L 0C H L 0E H L 10 HL 12 HL 14 HL Seg4 Seg8 00 HU 02 HU 04 HU 06 HU 08 HU 0A HU 0C H U 0E HU 10 HU 12 HU 14 HU Seg12 01 HL 03 HL 05 HL 07 HL 09 HL 0B HL 0D HL 0F HL 11 HL 13 HL 15 HL Seg16 01 HU 03 HU 05 HU 07 HU 09 HU 0B HU 0D HU 0F HU 11 H U 13 HU 15 HU DIG1 DIG2 DIG3 DIG4 DIG5 DIG6 DIG7 DIG8 DIG9 DIG10 DIG11
b0 XX HL
b3
b4 XX HU
b7
Note:
"0" in memory means V EE on output; "1" in memory means VDD on output. The key matrix is of 6 x 4 configuration, as shown below Figure 3. Key matrix and key-input data storage RAM
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STM86312
Display RAM address and display mode The data of each key are stored as illustrated below, and are read by the appropriate read command, starting from the least significant bit
KEY1 Seg1/KS1 Seg3/KS3 Seg5/KS5 b0 b3 b4 KEY4 KEY1 Seg2/KS2 Seg4KS4 Seg6/KS6 b7 KEY4 O
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LED port
STM86312
6
LED port
Data are written to the LED port by a write command, starting from the least significant bit of the port. When a bit of this port is 0, the corresponding LED lights; when the bit is 1, the LED goes off. The data of bits 5 through 8 are ignored. Figure 4.
MSB b3 b2 b1
LED port
LSB b0
LED1
LED2
LED3
LED4
Don't Care
On power application, all the LEDs remain dark.
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STM86312
SW data
7
SW data
The SW data are read by the appropriate read command, starting from the least significant bit. Bits 5 through 8 of the SW data are 0. Figure 5.
MSB 0 0 0 0 b3 b2 b1
SW data
LSB b0
SW1
SW2
SW3
SW4
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Commands
STM86312
8
Commands
A command sets the display mode and status of the VFD driver. The first 1 byte input to the STM86312 through the DIN pin after the STB pin has fallen is regarded as a command. If STB is set high while commands/data are transmitted, serial communication is initialized, and the commands/data being transmitted are invalid (however, the commands/data already transmitted remain valid).
8.1
Display mode setting command
This command initializes the STM86312 and selects the number of segments and number of grids (1/4 to 1/11 duty, 11 segments to 16 segments). When this command is executed, display is forcibly turned off, and key scanning is also stopped. To resume display, the display ON command must be executed. If the same mode is selected, however, nothing is performed. Figure 6.
MSB 0 0 b2 b1
Display mode settings
LSB b0
Display mode setting 000 : 4 digits, 16 segments 001 : 5 digits, 16 segments 010 : 6 digits, 16 segments 011 : 7 digits, 15 segments 100 : 8 digits, 14 segments 101 : 9 digits, 13 segments 110 : 10 digits, 12 segments 111 : 11 digits, 11 segments Don't Care
On power application, the 11-digit 11-segment mode is selected.
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STM86312
Commands
8.2
Data setting command
This command sets data write and data read modes. Figure 7.
MSB 0 1 0 b2 b1
Data setting command
LSB b0
Data write and read mode setting 00 : Write data to display memory 01 : Write data to LED port 10 : Read key data 11 : Read SW data ADDRESS INCREMENT MODE SETTING (DISPLAY MEMORY) 0= Increments address after data has been written 1= Fixed address Don't Care
On power application, the normal operation mode and address increment mode are set. Do not use STM86312 in test mode.
8.3
Address setting command
This command sets an address of the display memory Figure 8.
MSB 1 1 b4 b3 b2 b1
Address setting command
LSB b0
Address (00H-15H)
Don't Care
If address 16H or higher is set, the data are ignored, until a correct address is set. On power application, the address is set to 00H.
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Commands
STM86312
8.4
Display control command
Figure 9.
MSB 1 0 b3 b2 b1
Display control command
LSB b0
Display mode setting 000 : Set Pulse Width to 1/16 001 : Set Pulse Width to 2/16 010 : Set Pulse Width to 4/16 011 : Set Pulse Width to 10/16 100 : Set Pulse Width to 11/16 101 : Set Pulse Width to 12/16 110 : Set Pulse Width to 13/16 111 : Set Pulse Width to 14/16 TURNS ON/OFF DISPLAY 0= Display OFF (Key Scan Continues note) 1= Display ON Don't Care
On power application, the 1/16-pulse width is set and the display is turned off. Note: On power application, key scanning is stopped. Figure 10. Key scanning and display timing
Note:
* The value can be modified by trimmering R OSC. One cycle of key scanning consists of one frame, and data of 6 x 4 matrices are stored in RAM.
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STM86312
Serial communication format
9
Serial communication format
Figure 11. Reception (command/data write)
Figure 12. Transmission (data read)
Because the D OUT pin is an N-ch open-drain output pin, be sure to connect an external pullup resistor to this pin (1 k to 10 k). Note: *: When data are read, a wait time tWAIT of 1s is necessary within the rising edge of the eighth clock that has set the command and the falling one of the first clock that has read the data.
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Serial communication format Figure 13. Switching characteristics waveform
STM86312
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STM86312
Application
10
Application
Figure 14. Updating display memory by incrementing address
Command 1: sets display mode Command 2: sets data Command 3: sets address Data 1 to n: transfers display data (22 bytes max.) Command 4: controls display Figure 15. Updating specific address
Command 1: sets data Command 2: sets address Data: display data
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Application Figure 16. Application circuit
STM86312
Note: 1 2 3 4 5
ROSC = 47k for oscillator resistor R1=1~10 k for external pull-high resistor R2~R5 = 750~1.2 k R6~R9 = 10k for external pull-low resistor D1~D6 = 1N4001 Ef = Filament voltage for VFD.
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STM86312
Mechanical data
11
Mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
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Mechanical data
STM86312
PQFP44 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D D1 D3 E E1 E3 e L L1 K 0 0.73 1.80 0.29 0.11 13.2 10.00 8.00 13.2 10.00 8.00 0.80 0.88 1.6 3.5 7 0 1.03 0.029 2.00 TYP MAX. 2.45 0.25 2.20 0.45 0.23 0.071 0.011 0.004 0.520 0.394 0.315 0.520 0.394 0.315 0.031 0.035 0.063 3.5 7 0.041 0.079 MIN. TYP. MAX. 0.096 0.010 0.087 0.018 0.009 inch
0076922/D
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STM86312
Revision history
12
Revision history
Table 8. Revision history
Date 27-May-2004 27-Mar-2006 Revision 1 2 First Release New Temp, few changes Changes
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STM86312
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