STM86312 STMicroelectronics, STM86312 Datasheet
STM86312
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STM86312 Summary of contents
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... Serial interface (CLK, STB, D 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 ...
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... Display RAM address and display mode . . . . . . . . . . . . . . . . . . . . . . . 10 6 LED port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8.1 Display mode setting command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8.2 Data setting command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8.3 Address setting command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8.4 Display control command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 Serial communication format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 10 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 11 Mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2/24 STM86312 ...
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... STM86312 1 Block diagram Figure 1. Block diagram Block diagram 3/24 ...
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... Pin settings 2 Pin settings 2.1 Pin connection Figure 2. Pin connection 4/24 STM86312 ...
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... Reads serial data at rising edge, and outputs data at falling CLK edge. Initializes serial interface at rising or falling edge to make STM86312 waiting for reception of command. Data input after STB STB has fallen are processed as a command. While command data are processed, current processing is stopped, and the serial interface is initialized ...
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... Recommended operating conditions Table 4. Recommended operating conditions Symbol V Logic Supply Voltage DD V High Level Input Voltage IH V Low Level Input Voltage IL V Driver Supply Voltage EE 6/24 Parameter Parameter Parameter Min 4.5 0.7xV 0 0 STM86312 Value Unit - -40 (Grid) mA ...
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... STM86312 Maximum power consumption P dissipation + dynamic power consumption. Where segment current = 3 mA, grid current = 15 mA, and LED current = 20 mA, VFD driver dissipation = number of segments number of grids/(number of grids + (mW) R dissipation = (V L LED driver dissipation = number of LEDs x 20 (mW) Dynamic power consumption = V Example ...
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... 35V 25°C) A Value Min. Typ. =-1mA 0.9V OH1 DD =20mA OL1 -3 -15 50 100 SS 0.7V DD 0. 35V 25°C) A Value Min. Typ STM86312 = -20 A Unit Max 0 µA -10 150 kΩ ±1 µ -20 A Unit Max. 300 ns 100 2 µs 0.5 120 µs MHz 15 pF ...
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... STM86312 Table 7. Timing Characteristics (V noted. Typical values are at T Symbol PW Clock Pulse Width CLK PW Strobe Pulse Width STB t Data Setup Time SETUP t Data Hold Time HOLD t Clock-Strobe Time CLK-STB t Wait Time (Note 1) WAIT Note: Refer to page Serial Communication Format. = 4.5 to 5.5V 25° ...
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... Display RAM address and display mode 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 Seg4 Note: "0" in memory means V The key matrix configuration, as shown below Figure 3 ...
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... STM86312 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 Display RAM address and display mode KEY4 KEY1 Seg2/KS2 Seg4KS4 Seg6/KS6 b3 b4 KEY4 Ø b7 11/24 ...
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... 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. LED port MSB - - On power application, all the LEDs remain dark. 12/ STM86312 LSB b0 LED1 LED2 LED3 LED4 Don’t Care ...
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... STM86312 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. SW data MSB LSB b0 SW1 SW2 SW3 SW4 SW data 13/24 ...
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... 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 ...
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... This command sets data write and data read modes. Figure 7. Data setting command MSB 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. Address setting command MSB ...
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... 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 . STM86312 ...
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... STM86312 9 Serial communication format Figure 11. Reception (command/data write) Figure 12. Transmission (data read) Because the D OUT up resistor to this pin (1 kΩ kΩ). Note: *: When data are read, a wait time t 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 18/24 STM86312 ...
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... STM86312 10 Application Figure 14. Updating display memory by incrementing address Command 1: sets display mode Command 2: sets data Command 3: sets address Data 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 Application ...
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... Application Figure 16. Application circuit Ω Note 47k for oscillator resistor OSC Ω 1 R1=1~10 k for external pull-high resistor Ω 2 R2~R5 = 750 ~1.2 k Ω 3 R6~R9 = 10k for external pull-low resistor 4 D1~D6 = 1N4001 Filament voltage for VFD. 20/24 Ω STM86312 ...
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... STM86312 11 Mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® 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 ...
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... STM86312 inch MIN. TYP. MAX. 0.096 0.010 0.071 0.079 0.087 0.011 0.018 0.004 0.009 0.520 0.394 0.315 0.520 0.394 0.315 ...
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... STM86312 12 Revision history Table 8. Revision history Date 27-May-2004 27-Mar-2006 Revision 1 First Release 2 New Temp, few changes Revision history Changes 23/24 ...
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