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POWER MANAGEMENT MODE FUNCTIONAL DESCRIPTION

Power Management Mode (PMM)

13 Funcitons

TPS2384

SLUS634D – NOVEMBER 2004 – REVISED MARCH 2007

Power management mode (PMM) has been designed to work efficiently with simple low-cost microcontrollers

such as those in the MSP430 family.

The power management mode uses 13 self-contained functions to completely control the device operation. You

simply write/read through the I

C pins and wait for the function done bit to be set. If an A/D measurement was

performed during the function the results can be accessed by going to the read mode and addressing the proper

• Disable: Disable the port and reset all functions.

• Discovery 1: Enable the Discovery 1 condition which applies a 4.4 V across the PD and measure and store

the resulting current.

• Discovery 2: Enable the Discovery 2 condition which applies a 8.8 V across the PD and measure and store

the resulting current.

• V Sample: Measure the voltage between the P and N pins and store the result in the A/D voltage register.

• Legacy: Enable the 3.5-mA current source for measuring capacitance and measure the voltage across the P

and N terminals and store the result in the A/D voltage register.

• Classify: Enable the classification condition which applies 17.7 V across the PD and measure and store the

resulting current.

• Rup Pwr: Turn on the output switch while controlling the current being delivered to the PD until the PD

current needs are met or the max current is reached.

• C Sample: Continuous cycle of 31 current measurements and 1 voltage measurement. After each

measurement the contents of the appropriate register are updated.

• Rdwn: Turn off the output switch while controlling current until output current reaches 0 mA.

• AC LO: Turns on low side output FET and measures voltage between P and N pin and store result in A/D

voltage registers.

• AC HI: Turns on high side output FET and measures voltage between P and N pin and store result in A/D

voltage registers.

• ISample: Measure the current and store the result in the A/D current register.

• TSample: Measure the internal die temperature and store the result in the A/D temperature register.

Conversion times for A/D measurements performed as part of the functions listed above are generally as

shown in the typical values in the Electrical Characteristics table. However, conversion time is somewhat

dependant on the magnitude of the input signal being measured. Power management mode applications

should take precautions to test the A/D DONE bit (MSB of the high byte) of the pertinent results register

before accepting or using the returned value. A logic 1 at this bit location indicates the conversion is

complete. Also, once an A/D conversion is in process on a given port, subsequent function calls to that port

should wait until the currently executing conversion is complete. Commands written prior to completion may

cause the results of the initial conversion to be written to the register of the subsequent function.

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