TPS61165

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SLVS790A – NOVEMBER 2007 – REVISED MAY 2010

All bits are transmitted MSB first and LSB last. Figure 15 shows the protocol without acknowledge request (Bit

RFA = 0), Figure 15 with acknowledge (Bit RFA = 1) request. Prior to both bytes, device address byte and data

the bit transmission starts with the falling edge. If the CTRL pin is already at a high level, no start condition is

needed prior to the device address byte. The transmission of each byte is closed with an End of Stream

The bit detection starts with a falling edge on the CTRL pin and ends with the next falling edge. Depending on

The acknowledge condition is only applied if:

•

Acknowledge is requested by a set RFA bit.

•

The transmitted device address matches with the device address of the device.

•

16 bits is received correctly.

controller keeps the line low in this period. The master device can detect the acknowledge condition with its input

acknowledge condition ends.

Note that the acknowledge condition may only be requested if the master device has an open drain output. For a

push-pull output stage, the use a series resistor in the CRTL line to limit the current to 500mA is recommended to

for such cases as:

•

accidentally requested acknowledge, or

•

to protect the internal ACKN-MOSFET.

UNDERVOLTAGE LOCKOUT

An undervoltage lockout prevents operation of the device at input voltages below typical 2.2V. When the input

voltage is below the undervoltage threshold, the device is shutdown and the internal switch FET is turned off. If

the input voltage rises by undervoltage lockout hysteresis, the IC restarts.

THERMAL SHUTDOWN

An internal thermal shutdown turns off the device when the typical junction temperature of 160°C is exceeded.

The device is released from shutdown automatically when the junction temperature decreases by 15°C.

Copyright © 2007–2010, Texas Instruments Incorporated

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