TSYS01 Rev E0.3

www.meas-spec.com

2012-01-13

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INTERFACE DESCRIPTION

PROTOCOL SELECTION

PS pin input level has to be defined in dependence to protocol selection.

• PS = 0 activates SPI.

I

A I

Each command consists of two bytes: the address byte and command byte.

I

The I

•

CSB=1 then the address is 1110110x.

•

CSB=0 the address is 1110111x.

Therefore, two TSYS01 can be interfaced on the same I

SPI INTERFACE

The serial interface is a 4-wire SPI bus, operating as a slave. CS (chip select), SCLK (serial clock), SDI

(serial data in), and SDO (serial data out) are used to interact with the SPI master.

Communication with the chip starts when CS is pulled to low and ends when CS is pulled to high.

SCLK is controlled by the SPI master and idles low (SCLK low on CS transitions, mode 0).

A mode where the clock alternatively idles high is also supported (mode 3).

COMMANDS

The commands are the same for SPI and I

There are four commands:

•

Reset

•

Read PROM (calibration parameters)

•

Start ADC Temperature conversion

•

Read ADC Temperature result

Command

Hex Value

Reset

0x1E

Start ADC Temperature Conversion

0x48

Read ADC Temperature Result

0x00

PROM Read Address 0

0xA0

PROM Read Address 1

0xA2

PROM Read Address 2

0xA4

PROM Read Address 3

0xA6

PROM Read Address 4

0xA8

PROM Read Address 5

0xAA

PROM Read Address 6

0xAC

PROM Read Address 7

0xAE