Rainbow Electronics U6820BM - Manual

1
Features
• Four Short-circuit-protected High-side Drivers with a Maximum Current Capability of
50 mA Each
• Four Short-circuit-protected Low-side Drivers with a Maximum Current Capability of
50 mA Each
• ON Resistance High Side R
on
< 10
Ω
Versus Total Temperature Range
• ON Resistance Low Side R
on
< 7
Ω
Versus Total Temperature Range
• Short-circuit Detection of Each Driver Stage
• Disabling of Driver Stages in the Case of Short-circuit and Overtemperature Detection
• Independent Control of Each Driver Stage via an 8-bit Shift Register
• Status Output Reports Short-circuit Condition
• Status Output Reports when All Loads Are Switched Off
• Timing of Status Output Reset Signalizes Failure Mode
• Temperature Protection in Conjunction with Short-circuit Detection
Description
The U6820BM is a driver interface in BCDMOS technology with 8 independent driver
stages having a maximum current capability of 50 mA each. Its partitioning into 4
high-side and 4 low-side driver stages allows an easy connection of either 4 half-
bridges or 2 H-bridges on the pc board. The U6820BM communicates with a micro-
controller via an 8-bit serial interface. Integrated protection against short circuit and
overtemperature give added value. EMI protection and 2-kV ESD protection together
with automotive qualification referring to conducted interference (ISO/TR 7637/1)
make this IC ideal for both automotive and industrial applications.
Figure 1. Block Diagram
V
CC
STATUS
CLK
DI
CS
HS4 HS3 HS2 HS1
Thermal protection
6 9 8 1
Control
logic
16
3
Power-on reset
V
CC
V
CC
2 7 10 15
5
V
CC
V
CC
4
14
11
13
12
LS1 LS2 LS3 LS4 GND
CC
H H
3
S S
4
S
2
S
1
L
S
3
L
S
4
L
S
2
L
S
1
Input Register
H H
Current
limiter
Current
limiter
Current
limiter
Current
limiter
Current
limiter
Current
limiter
Current
limiter
Current
limiter
GND S
V
S
Dual Quad
BCDMOS
Driver IC
U6820BM
Rev. 4527A–BCD–03/02