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MIC5400
Pin Configuration
Pin Description
A4 1
A3 2
A2 3
A1 4
LOAD 5
SHFTCLK 6
VDD 7
GND 8
SHIFTIN 9
SHIFTOUT 10
B1 11
B2 12
B3 13
B4 14
28-Lead SOIC
28 A5
27 A6
26 A7
25 A8
24 VDDA
23 BD_A
22 GND
21 IREF
20 BD_B
19 VDDB
18 B8
17 B7
16 B6
15 B5
Micrel
Pin Number
Pin
1,2,3,4
5
6
7
8,22
9
10
11,12,13,14
15,16,17,18
19
20
21
23
24
25,26,27,28
Pin Name
Name
A4,A3,A2,A1
LOAD
SHFTCLK
VDD
GND
SHIFTIN
SHIFTOUT
B1,B2,B3,B4
B5,B6,B7,B8
VDDB
BD_B
REF
BD_A
VDDA
A8,A7,A6,A5
Pin Function
Function
Current Sink pins to be connected to LED cathodes
If this pin is Low, the device acts as a shift register. When this pin is High,
only the first falling edge of the clock transfers data from the Shift-Register to
the Parallel Register. The next rising edge transfers data from the Status
Register to the Shift Register
Shift-register Clock Input
Positive Supply Voltage
Ground
Shift-register Data Input
Shift-register Data Output
Current Sink pins to be connected to LED cathodes
Current Sink pins to be connected to LED cathodes
Analog Power source pins which provide current sense points for Channel A
and Channel B PNP emitter currents, independently.
Base Drive Outputs for external PNP transistors. Feedback Loop compensa-
tion requires one external capacitor at each PNP transistor collector.
Reference current output. Must be connected to an external resistor to set
the maximum current for the current sink outputs.
Base Drive Outputs for external PNP transistors. Feedback Loop compensa-
tion requires one external capacitor at each PNP transistor collector.
Analog Power source pins which provide current sense points for Channel A
and Channel B PNP emitter currents, independently.
Current Sink pins to be connected to LED cathodes
MIC5400
2
January 2005
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