JAJSP25 データシート

JAJSP25 November 2023 TPS546A24S

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6.5.2 Pin Strapping

The TPS546A24S provides four IC pins that allow the initial PMBus programming value on critical PMBus commands to be selected by the resistors connected to that pin without requiring PMBus communication. Whether a specific PMBus command is initialized to the value selected by the detected resistance or stored NVM memory is determined by the commands bit in the PIN_DETECT_OVERRIDE PMBus Command. The four pins and the commands they program for a loop controller or Stand-alone device (GOSNS connected to Ground) are provided in Table 6-7.

Each pin can be programmed in one of four ways:

Pin shorted to AGND with less than 20 Ω
Pin floating or tied to BP1V5 with more than 1 MΩ
Pin bypassed to AGND through a 1% or better tolerance resistor according to R2G code only (16 Resistor Options)
Pin bypassed to AGND through a 1% or better tolerance resistor according to R2G code and to BP1V5 according to Divider Code (16 Resistor x 16 Resistor Divider Options)

Due to the flexibility of programming options with up to 274 configurations per pin, TI recommends that designers consider using one of the available design tools, such as TPS546x24S Compensation and Pin-Strap Resistor Calculator to assist with proper programming resistor selection.

Table 6-7 TPS546A24S Pin Programming Summary

PIN	RESISTORS	PMBus REGISTERS
MSEL1	Resistor to AGND	COMPENSATION_CONFIG
MSEL1	Resistor Divider	COMPENSATION_CONFIG, FREQUENCY_SWITCH
MSEL2	Resistor to AGND	IOUT_OC_WARN_LIMIT, IOUT_OC_FAULT_LIMIT, STACK_CONFIG
MSEL2	Resistor Divider	TON_RISE
VSEL	Both	VOUT_COMMAND, VOUT_SCALE_LOOP, VOUT_MAX, VOUT_MIN
ADRSEL	Resistor to AGND	DEVICE_ADDRESS
ADRSEL	Resistor Divider	DEVICE_ADDRESS, SYNC_CONFIG, INTERLEAVE

Note:

Resistor divider values of "none" can be implemented with no resistor to BP1V5 or use a 1-MΩ resistor to BP1V5 for improved reliability and noise immunity.

Loop follower with GOSNS tied to BP1V5 only use the resistor from MSEL2 to AGND to program the following:

The loop follower receives all other pin programmed values from the loop controller over BCX as part of the power-on reset function.

Note:

The high precision Pin-Detection programming which provides 8-bit resolution for each pin in the TPS546A24S can be sensitive to PCB contamination from flux, moisture, and debris. As such, users must consider committing Pin Programmed values to User Non-Volatile memory and disable future use of Pin Strapped values as part of the product flow. The programming sequence to commit Pin Programmed PMBus register values to NVM and disable future use of Pin Strapped programming is:

Select MSEL1, MSEL2, VSEL and ADRSEL programming resistors to program the desired PMBus register values.
Power AVIN and VDD5 above their UVLOs to initiate pin detection and enable PMBus communication.
Update any PMBus register values not programmed to their final value by Pin Detection.
Write the value 0000h using the Write Word protocol to (EEh) MFR_SPECIFIC_30 (PIN_DETECT_OVERRIDE).
Send the command code 15h using the Send Byte protocol to initialize a (15h) STORE_USER_ALL function.
Allow a minimum 100 ms for the device to complete a burn of NVM User Store. Loss of AVIN or VDD5 power during this 100 ms can compromise the integrity of the NVM. Failure to complete the NVM burn can result in a corruption of NVM and a POR fault on subsequent power on resets.

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6.5.2 Pin Strapping