TMP007 datasheet(19/55 Pages) TI

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TMP007

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SBOS685C – APRIL 2014 – REVISED JULY 2015

7.3.8.4 Slave Mode Operations

The TMP007 operates as a slave receiver or slave transmitter.

7.3.8.4.1

Slave Receiver Mode

The first byte transmitted by the master is the slave address, with the R/W bit low. The TMP007 then

acknowledges reception of a valid address. The next byte transmitted by the master is the pointer register. The

TMP007 then acknowledges reception of the pointer register byte. The next two bytes are written to the register

addressed by the pointer register. The TMP007 acknowledges reception of both data bytes. The master

terminates data transfer by generating a start or stop condition.

7.3.8.4.2

Slave Transmitter Mode:

The first byte is transmitted by the master and is the slave address, with the R/W bit high. The TMP007

acknowledges reception of a valid slave address. The next two bytes transmitted by the TMP007 are the value in

the register indicated by the pointer register.

The master acknowledges reception of both data bytes. The master terminates the data transfer by generating a

not-acknowledge bit on reception of any data byte, or generating a start or stop condition.

7.3.8.5 SMBus Alert Function

The TMP007 supports the SMBus alert function. When the TMP007 is operating in interrupt mode (TM = 1), the

ALERT pin of the TMP007 can be connected as an SMBus alert signal. When a master senses that an alert

condition is present on the ALERT line, the master sends an SMBus alert command (00011001) on the bus. If

the ALERT pin of the TMP007 is active, the devices acknowledge the SMBus alert command and respond by

returning its slave address on the SDA line. The eighth bit (LSB) of the slave address byte indicates if the cause

of the alert condition is caused by the temperature exceeding THIGH or falling below TLOW. This bit is high if the

temperature is greater than THIGH. This bit is low if the temperature is less than TLOW. See Figure 26 for details of

this sequence.

If multiple devices on the bus respond to the SMBus alert command, arbitration during the slave address portion

of the SMBus alert command determines which device clears the alert status. If the TMP007 wins the arbitration,

its ALERT pin becomes inactive at the completion of the SMBus alert command. If the TMP007 loses the

arbitration, the TMP007 ALERT pin remains active.

7.3.8.6 General Call

The TMP007 responds to a two-wire general call address (0000000) if the eighth bit is 0. The device

acknowledges the general call address and respond to commands in the second byte. If the second byte is

00000110, the TMP007 internal registers are reset to power-up values.

7.3.8.7 High-Speed (Hs) Mode

In order for the two-wire bus to operate at frequencies above 400 kHz, the master device must issue an SMBus

Hs-mode master code (00001xxx) as the first byte after a start condition to switch the bus to high-speed

operation. The TMP007 does not acknowledge this byte, but switches its input filters on SDA and SCL, and its

output filters on SDA to operate in Hs-mode, allowing transfers at up to 2.5 MHz. After the Hs-mode master code

has been issued, the master transmits a two-wire slave address to initiate a data transfer operation. The bus

continues to operate in Hs-mode until a stop condition occurs on the bus. Upon receiving the stop condition, the

TMP007 switches the input and output filters back to fast-mode operation.

7.3.8.8 Timeout Function

The TMP007 resets the serial interface if SCL is held low for 30 ms (typ) between a start and stop condition. The

TMP007 releases the bus if SCL is pulled low and waits for a start condition. To avoid activating the timeout

function, maintain a communication speed of at least 1 kHz for SCL operating frequency.

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