STM86312 datasheet(4/16 Pages) STMICROELECTRONICS

部件名	STM86312

功能描述	1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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STM86312

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Table 4: Recommended Operating Conditions

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 x5 (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 = 30

2/50 x 17 = 306

LED driver dissipation = 4 x 20 = 80

Dynamic power consumption = 5 x 5 = 25

Total 553 mW.

Table 5: Electrical Characteristics (VDD = 4.5 to 5.5V, VSS =0V, VEE =VDD - 35V, TA = -20 to 70°C,

unless otherwise noted. Typical values are at TA = 25°C)

Symbol

Parameter

Min

TYP

Max

Unit

VDD

Logic Supply Voltage

4.5

5

5.5

V

VIH

High Level Input Voltage

0.7xVDD

VDD

V

VIL

Low Level Input Voltage

0

0.3xVDD

V

VEE

Driver Supply Voltage

0

VDD-35

V

Symbol

Parameter

Test Conditions

Value

Unit

Min.

Typ.

Max.

VOH1

High Level Output Voltage

LED1-LED4, IOH1=-1mA

0.9VDD

V

VOL1

Low Level Output Voltage

LED1-LED4, IOL1=20mA

1

V

VOL2

Low Level Output Voltage

DOUT,IOL2 =4mA

0.4

V

IOH21

High Level Output Current

VO =VDD - 2V, Seg1 to Seg11

-3

mA

IOH22

High Level Output Current

VO =VDD -2V, Grid1 toGrid6,

Seg12/Grid11 to Seg16/Grid7

-15

mA

IOLEAK Driver Leakage Current

VO =VDD - 35V, driver off

-10

µA

RL

Output Pull-Down Resistor

Driver Output

50

100

150

k

Ω

II

Input Current

VI =VDD or VSS

±1

µA

VIH

High Level Input Voltage

0.7VDD

V

VIL

Low Level Input Voltage

0.3VDD

V

VHYS

Hysteresis Voltage

CLK, DIN,STB

0.35

V

IDDdyn

Dynamic Current Consumption

Under no load, display off

5

mA

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