STMicroelectronics UM0547 Evaluation Board for ABS Valve Drivers System User Manual

STMicroelectronics UM0547 Evaluation Board for ABS Valve Drivers System

Overview

This document concern the main features of PTB801DC valve drivers for ABS board with 2 x L9349 devices.

Introduction

The PTB801DC is a complete demonstrator of an ABS system based on STMicroelectronics devices. The board implements a flexible and open design demonstrating the capability of the STMicroelectronics 16/32 bit microcontrollers and devices for ABS applications. The PTB801DC mounts two L9349 devices and accept external signal coming from PTB801 MB.

Main components

• L9349 valve drivers
• Connector for valves with supply
• Connector for I/O, enables signals
• Standardized CPU board connector (PTB801 MB) providing access to off board I/O, PWM, SPI and power supply

Evaluation board description

The PTB801DC is a valve drivers board for ABS system based on STMicroelectronics  devices. The board implements a flexible and open design demonstrating the capability of the STMicroelectronics for ABS applications. The PTB801DC mounts two L9349 devices, the control coming from UN24 mother board.
The board has opened connectivity to external valves.

Features

General features of this board are:

• Full evaluation and development system based on the system basis chip L9349
• Full system evaluation: integration, basic and safety functions

L9349 quad intelligent power low-side switch

The L9349 is a monolithic integrated quad low side driver realized in an advanced BCD multipower mixed technology. The device is intended to drive valves in automotive environment.

Figure 1. L9349 pin connection (top view)

The L9349 is a quad low-side driver with following functions:

• Quad power low side driver with 2 x 5 A and 2 x 3 A output current capability
• Low RDSON typically 200 mΩ and 300 mΩ @ Tj = 25 °C
• Internal output clamping structures with VFB = 50V for fast inductive load current recirculation
• Limited output voltage slew rate for low EMI
• Protected µP compatible enable and input
• Wide operating supply voltage range 4.5 V to 32 V
• Real time diagnostic functions:
  • Output shorted to GND
  • Output shorted to VSS
  • Open load detection in ON and OFF condition
  • Load bypass detection
  • Overtemperature detection
• Device protection functions:
  • Overload disable
  • Selective thermal shutdown
• Signal- and power-ground-loss shutdown

Figure 2. L9349 block diagram

Board connections

PTB801DC has many connector to communicate with:

• UN24 mother board
• External valves

Figure 3. Valves controlled by first L9349

Figure 4. Valves controlled by second L9349

The following table describes the pin out of the valve connectors J5 and J6:

Table 1. Valve connectors J5 and J6

On the board, there are three connectors to monitoring the input (INx_1), output (Qx_1), and status (STx_1) of the drivers.

Figure 5. First L9349 signals monitoring connectors

The following table describes the pin out of the first signals monitoring connectors J4, J8 and J10:

Table 2. Valve connectors J4, J8 and J10

On the board, there are three connectors to monitoring the input (INx_2), output (Qx_2), and status (STx_2) of the drivers.

Figure 6. Second L9349 signals monitoring connectors

The following table describes the pin out of the second signals monitoring connectors J7, J9 and J11:

Table 3. Valve connectors J7, J9 and J11

On the board there are a connector to monitoring the enabled status of the L9349 drivers.

Figure 7. Enabled status connectors

The following table describes the pin out of the enable L9349 drivers:

Table 4. Valve connectors J3

Before you start

This section describes operations needed before powering up the board.
Before powering up the mother board, could connect:

• Daughter board 2 x L9349
• Wheel Speed Sensor board
• µC mini module (ST10/SPC family)

How to exercise diagnostic functionality

The PTB801DC has many diagnostic features. Please see the L9349 datasheet for detail.

Hardware

This chapter describes all the hardware modules of the board.

PTB801DC overview

The PTB801DC is a specific platform for ABS valve drivers system with parallel interface.

Figure 8. Layout 2 x L9349

Revision history

Table 5. Document revision history

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