TP6312
1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER
Transmission (data read)
b0
b1
b2
b3
b5
b4
b6
b7
1
23
45
67
8
1
23
45
6
b0
b1
b2
b3
b5
b4
STB
DIN
CLK
DOUT
tWAIT
Data reading command is set.
Data reading starts.
Because the DOUT pin is an N-ch open-drain output
pin, be sure to connect an external pull-up resistor to
this pin (1k
Ω to 10 kΩ).
*: When data is read, a wait time (tWAIT) of 1µs is
necessary from the rising of the eighth clock that has
set the command till the falling of the first clock that
has read the data.
Absolute Maximum Ratings (Ta = 25°C, Vss = 0V)
Parameter
Symbol
Ratings
Unit
Logic Supply Voltage
VDD
-0.5 to + 7.0
V
Driver Supply Voltage
VEE
VDD +0.5 to VDD -40
V
Logic Input Voltage
Vi1
-0.5 to VDD +0.5
V
VFD Driver Output Voltage
Vo2
VEE –0.5 to VDD +0.5
V
LED Driver Output Current
Io1
+25
mA
VFD Driver Output Current
Io2
-40 (grid)
-15 (segment)
mA
Power Dissipation
PD
800
*
mW
Operating Ambient Temperature
Topt
-40 to +70
℃
Storage Temperature
Tstg
-65 to +150
℃
* Derate at –6.4 mW/℃ at Ta = 25℃ or higher.
Recommended Operating Conditions (Ta = -20°C to +70°C, Vss = 0V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Test Condition
Logic Supply Voltage
VDD
4.5
5
5.5
V
High-Level input Voltage
VIH
0.7VDD
VDD
V
Low-Level input Voltage
VIL
0
0.3VDD
V
Driver Supply Voltage
VEE
0
VDD-35
V
Maximum power consumption PMAX = VFD driver dissipation + RL dissipation + LED driver dissipation + dynamic power
consumption.
Where segment current = 3 mA, grid current = 15mA, 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)
Electrical Characteristics (Ta = -20°C to +70°C, VDD = 4.5V to 5.5V, VS = 0V, VEE = VDD - 35V)
Parameter
Symbol
Min
Typ.
Max.
Unit
Test Conditions
High-Level Output Voltage
VOH1
0.9 VDD
V
LED1 – LED4, IOH1 = -1 mA
Low-Level Output Voltage
VOL1
1
V
LED1 – LED4, IOL1 = 20 mA
Low-Level Output Voltage
VOL2
0.4
V
DOUT, IOL2 = 4 mA
High-Level Output Current
IOH21
-3
mA
VO = VDD –2V, Seg1 to Seg11
High-Level Output Current
IOH22
-15
mA
VO = VDD –2V,Grid1 to Grid6,
Seg12/Seg 11 to Seg16/Seg 7
Driver Leakage Current
IOLEAK
-10
µA
VO = VDD - 35V, Drive off
Output Pull-Down Resistor
RL
50
100
150
k
Ω
Drive output
Input Current
Ii
±1
µA
VI = VDD or VSS
High-Level Input Voltage
VIH
0.6 VDD
V
Low-Level Input Voltage
VIL
0.3 VDD
V
Hysteresis Voltage
VH
0.35
V
CLK, DIN, STB
Dynamic Current Consumption
IDDdyn
5
mA
Under no load, display off
Version 1.1
Page 5 of 9
http://www.topro.com.tw
September 2003
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