80310 datasheet(10/31 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

80310

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

Bandgap

Integrated Supply

TC80310 - Functional Block Diagram

Logic & Control

A/D Converter

Supply Voltage

Logic& Control

Power

Clock

OTP

Digital

Die Temperature

Phase Low & High

Power Stage

Divider/Filter

POR

LIN

Charge Pump

Drive and

Protection

Current

Measurement

Figure 7. Functional Internal Block Diagram

SUPPLY VOLTAGE: FILTER/DIVIDER, BANDGAP,

AND POR

An input filter and divider provides a clean image of the

battery to the digital regulation loop circuit. The divider ratio

can be adjusted by OTP.

The supply block provides the voltages for the internal

blocks of the 80310:

• Main logic

• Analog permanently powered or not

• LIN transceiver

• Charge pump

The purpose of the POR block is to generate a clean

power-on signal to the main logic.

The Bandgap block provides the voltage and current

references for the other blocks.

POWER STAGE: CHARGE PUMP, DRIVE AND

PROTECTION, CURRENT MEASUREMENT

The power stage of the circuit consists of the gate driver

with a charge pump and protection to control a low side driver

switching the excitation current. A short-circuit is

instantaneously detected and the excitation current is turned

off until the next regulation cycle. A freewheeling diode is

inserted between the EXC and GND pins, across the

excitation coil for the energy recirculation.

The current measurement block provides a proportional

value of the excitation current flowing in the high side switch.

LOGIC AND CONTROL:

DIGITAL

The digital block gathers all the digital functions of the

device. The main functionality is described in the device

operation paragraph.

CLOCK

This block is the clock reference for the digital block. The

oscillator generates a 5.0 V square wave at the frequency of

4.0 MHz in Normal mode operation.

OTP

This block allows an easy configuration and adjustment of

the circuit. A set of NVM bits can be programmed during the

factory test phase. They are described in Table 6.

PHASE LOW & HIGH

The phase detector monitors the Phase inputs and sends

filtered low and high levels to the main logic when either one

has reached the detection level (1.0 V at startup and 8.0 V

afterwards).

ADC

The analog to digital converter is used in the voltage

regulation loop, in the current feedback and in temperature

measurement.

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