PS081 datasheet(81/155 Pages) AMSCO

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PSØ81

Annotations:

You should make sure to erase the EEPROM before starting the sequence

SPI_ENA must be HIGH. This enables the SPI-Slave mode and the SPI interface.

When the measurement is started, new data is indicated by SPI_DO. Connect this wire to an input

of your microcontroller and poll this pin. Alternatively connect it to an interrupt pin.

When the interrupt is triggered please toggle the SPI_CSN pin in order to switch the SPI_DO wire

from interrupt to communication mode (see pictures below)

The hex-numbers in braces are the SPI opcodes. Please see chapter 4.5 SPI-Interface of the

PS081 data sheet for an overview.

There is also a way to store the configuration steadily in the EEPROM and only activate it by a pow-

er reset. Ask us for further information if you want to realize this way.

Erasing the EEPROM, if required, can be done the following way:

Power reset (0xF0)

Erase EEPROM: Bgap on (0x87)

EEPROM enable on (0x91)

EEPROM block erase 0 (0xA4, AddHi = 0)

EEPROM block erase 1 (0xA4, AddHi = 1)

EEPROM block erase 2 (0xA4, AddHi = 2)

EEPROM block erase 3 (0xA4, AddHi = 3)

Bgap off (0x86)

EEPROM enable off (0x90)

It is recommended to read the HB0 result from RAM address 0. Reading from RAM address 20

(also HB0 result) can result in a adress pointer conflict which is avoided when reading on address

0. Please note, that the HB0 result is automatically copied to RAM address 0 as long as there is no

program in the EEPROM (pure Front-End converter operation).

If you have an additional EEPROM

program (e.g. pre-processing) you need to copy the HB0 result from address 20 to address 0

manually!

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PS081 Datasheet(PDF) 81 Page - ams AG