HAL855 datasheet(40/102 Pages) MICRONAS

40 / 102 page

HAL8xy, HAL100x

APPLICATION NOTE

Programmer Board

Sept. 19, 2013; APN000046_03EN

Micronas

5.3.

Programming of the Sensor

5.3.1.

Definition of Programming Pulses

The sensor is addressed by modulating a serial telegram on the supply voltage. The

sensor answers with a serial telegram on the output pin.

The bits in the serial telegram have a different bit time for the VDD-line and the output.

The bit time for the VDD-line is defined through the length of the Sync bit at the begin-

ning of each telegram. The bit time for the output is defined through the Acknowledge

bit.

A logical “0” is coded as no voltage change within the bit time. A logical “1” is coded as

a voltage change between 50% and 80% of the bit time. After each bit, a voltage

change occurs.

5.3.2.

Definition of the Telegram

Each telegram starts with the Sync bit (logical 0), 3 bits for the Command (COM), the

Command Parity bit (CP), 4 bits for the Address (ADR), and the Address Parity bit (AP).

There are 4 kinds of telegrams:

Write a register

After the AP bit, follow 14 Data bits (DAT) and the Data Parity bit (DP). If the telegram is

valid and the command has been processed, the sensor answers with an Acknowledge

bit (logical 0) on the output (see Fig. 5–2).

Read a register

After evaluating this command, the sensor answers with the Acknowledge bit, 14 Data

bits, and the Data Parity bit on the output (see Fig. 5–3).

Programming the

EEPROM cells

After evaluating this command, the sensor answers with the Acknowledge bit. After the

delay time tw, the supply voltage rises up to the programming voltage (see Fig. 5–4).

Activate a sensor

If more than one sensor is connected to the supply line, selection can be done by first

deactivating all sensors. The output of all sensors will be pulled to ground. With an Acti-

vate pulse on the appropriate output pin, an individual sensor can be selected. All fol-

lowing commands will only be accepted from the activated sensor (see Fig. 5–5).

Note: In case of HAL 82x, HAL83x, HAL 880 and HAL1002 an additional 10 k

 pull-

down resistor is required during programming. Firmware rev. 1.33 can be used

alternatively.

Lock a sensor

To lock the EEPROM registers, the lock bit has to be set. In case of HAL 82x, HAL83x,

HAL880 and HAL1002 it is necessary to write the lock bit into the lock register (see

Fig. 5–2). If the telegram is valid and the command has been processed, the sensor

answers with an Acknowledge Bit (logical 0) on the output. In order to store the lock bit

permanently, an erase and program command have to be sent to the sensor. The is the

same procedure as mentioned above (see Programming the EEPROM cells and

Fig. 5–4). The EEPROM registers are locked after a power on reset. For HAL 805,

HAL 815, HAL817, HAL 810 and HAL1000 the lock command must be used.

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