HAL855 datasheet(87/102 Pages) MICRONAS

87 / 102 page

APPLICATION NOTE

HAL8xy, HAL100x

Programmer Board

Micronas

Sept. 19, 2013; APN000046_03EN

7.3.

Programming of the Sensor

7.3.1.

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.

7.3.2.

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. 7–2).

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. 7–3).

Programming the

EEPROM cells

In order to permanently store the written data into the EEPROM cells, an erase and

program command have to be sent to the sensor. After the recognition of the erase and

program commands, the HAL856 answers with an acknowledge pulse on its output sig-

nal. After the acknowledge pulse, a pulse on the VDD-line is created to start the charg-

ing of the EEPROM cells. Then the supply voltage is kept constant during the charging

time. To stop the charging, a further command is sent to the HAL856. This stopping

command can be a further programming command or a read command (see Fig. 7–4).

Lock a sensor

To lock the EEPROM registers, the lock bit has to be programmed. Write the lock bit

into the lock register (see Fig. 7–2). 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. This is the same procedure as mentioned above (see Programming

the EEPROM cells and Fig. 7–4. The EEPROM registers are locked after a power on

reset.

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