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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

< 10 Ω Versus Total Temperature Range

• ON Resistance Low Side R

< 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

STATUS

CLK

HS4 HS3 HS2 HS1

Thermal protection

8 1

Control

logic

Power-on reset

1015

LS1LS2LS3LS4

GND

Input Register

Current

limiter

Current

limiter

Current

limiter

Current

limiter

Current

limiter

Current

limiter

Current

limiter

Current

limiter

GND

Dual Quad

BCDMOS

Driver IC

U6820BM

Rev. 4527A–BCD–03/02

Summary of content (11 pages)

PAGE 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 Ron < 10 Ω Versus Total Temperature Range ON Resistance Low Side Ron < 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 D
PAGE 2
Pin Configuration Figure 2.
PAGE 3
U6820BM Description of the Control Interface to the Microcontroller The serial-parallel interface basically includes an 8-bit shift register (SR), an 8-bit command register (CR) and a 4-bit counter. The data input takes place with commands at Pins DI (data input), CS (chip select) and CLK (clock). With a falling edge at CLK, the information at DI is transferred into the SR. The first information written into the SR is the least significant bit (LSB).
PAGE 4
Short-circuit Protection The current of the output stages is limited by an active feedback control. Short circuit at one output stage sets the diagnostic Pin 14 (STATUS) to high. In case of both conditions, short circuit at one of the outputs and temperature detection, the affected output is switched off selectively. It will be activated again after the first new data transfer.
PAGE 5
U6820BM Figure 3. Data Transfer Timing Diagram t CSCLK t t CLKP CLKH tr CLK tf 90 % LSB t CLKCS 90 % 50% MSB 10% t CLKL 50% DI t DICLK t DIH/L t CS CS 50% t CLKCSH Table 2.
PAGE 6
Figure 4.
PAGE 7
U6820BM Absolute Maximum Ratings Parameters Pin Symbol Minimum Maximum Unit Supply voltage 3 VVS -0.3 +40 V Logic supply voltage 6 VVCC -0.3 +7 V 11, 12 13 CS, CLK, DI -0.3 VVCC + 0.5 V 14 STATUS -0.3 VVCC + 0.3 V Logic input voltage Logic output voltage 3 IVS 0.
PAGE 8
Electrical Characteristics 7 V < VVS < 40 V; 4.5 V < VVCC > 5.5 V; -40°C < Tj < 150°C; unless otherwise specified No. 1 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* Current Consumption 1.1 Supply current VS No external load 3 IVS 0.2 mA A 1.2 Supply current VCC No external load 6 IVCC 5 mA A 1.3 Power-on reset threshold 6 VCC POR 3.4 3.7 4.0 V A 1.
PAGE 9
U6820BM Figure 5. Application Circuit Typical application with 4 Hall-ICs for rotational speed detection + VCC 5V 100nF 33µF RR LR RF LF R* 4.7nF R* 4.7nF R* 4.7nF VBATT R* 4.
PAGE 10
Ordering Information Extended Type Number Package U6820BM-FP Remarks SO16 Package Information 5.2 4.8 Package SO16 10.0 9.85 Dimensions in mm 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 8.89 16 0.2 3.
PAGE 11
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