BU2872AK Datasheet, PDF (2/4 Pages) Rohm – FL tube driver

Standard ICs
BU2872AK
•^{Pin descriptions}
Pin No.
Pin
Name
I/O
Function
14, 38
VDD
Power supply pin 1
I Connected to the power supply of the system
44
OSC
Oscillation pin
I / O Connected to the oscillation capacitor
7, 43
VSS
GND pin
I Connected to the ground of the system
6
SI
Serial data input
I Serial data input starting from MSB
5
SO
Serial data output
O Serial data output starting from MSB
8
SCK
Serial clock input
I Serial data read at rising edge
9
CS
Serial chip select
I Serial initialization at "L", effective at "H"
15 ~ 25
S1 ~ S11
High withstanding voltage
output pin for segment
O
Output pin for segment
Output: Pch open drain + pull-down resistance
27
VEE
Power supply pin 2
I Pull-down resistance connection for FLP driver
37 ~ 32
G1 ~ G6
High withstanding voltage
output pin for grid
Output pin for grid
O _{Output: Pch open drain + pull-down resistance}
High withstanding voltage
26, 28 ~ 31 S12 / G11 ~ S16 / G7 _{output pin for segment / grid}
O
Segment / grid output selectable pin
Output: Pch open drain + pull-down resistance
42 ~ 39
L1 ~ L4
Output pin for LED
O Output pin for LED; output is CMOS output
10 ~ 13
K1 ~ K4
Key data input pin
I Data input pin for key scanning
1~4
SW1 ~ SW4
General-purpose input pin
I
General-purpose input pin
Input data sent to microcomputer in serial format
•^{Absolute maximum ratings (Ta = 25°C, VSS = 0V)}
Parameter
Symbol
Limits
Unit
Applied voltage 1
Applied voltage 2
VDD
– 0.3 ~ + 7.0
V
VEE
VDD + 0.3 ~ VDD – 35
V
Input voltage
Power dissipation
VIN
– 0.3 ~ VDD + 0.3
V
Pd
850^∗
mW
Operating temperature
Storage temperature
Topr
– 25 ~ + 75
°C
Tstg
– 55 ~ + 125
°C
Note) Operation is not guaranteed at these values.
Power dissipation is reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
∗ When mounted on a 70mm × 70mm × 1.6mm glass epoxy board
•^{Recommended operating conditions (Ta = 25°C, VSS = 0V)}
Parameter
Symbol Min. Typ. Max.
Unit
Operating power supply voltage 1
VDD
4.5
5.0
5.5
V
Operating power supply voltage 2
VEE
VDD – 32 VDD – 30 VDD – 0
V
2