SLVSH95 Data sheet | TI.com

SLVSH95 July 2024 TPS546C25

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slvsh95_oa

7.74 (DDh) EXT_WRITE_PROTECTION

CMD Address	DDh
Write Transaction:	Write Word
Read Transaction:	Read Word
Format:	Unsigned Binary (2 bytes)
NVM Back-up:	EEPROM
Updates:	On-the-fly

This command configures additional register write protection beyond the standard PMBus write protection (10h) WRITE_PROTECT.

Return to Supported PMBus Commands.

Figure 7-82 (DDh) EXT_WRITE_PROTECTION Register Map

15	14	13	12	11	10	9	8
R	RW	RW	RW	RW	RW	RW	RW
0	WPL	TRIML	VOCL	VOFCL	WRNL	IO_TEMPL	MRGNL

7	6	5	4	3	2	1	0
RW	RW	RW	RW	RW	RW	RW	RW
OPL	DFGL	VIFCL	SQNCL	MFRDL	PSKYL	RNVML	SNVML

LEGEND: R/W = Read/Write; R = Read only

Table 7-87 Register Field Descriptions

Bit	Field	Access	Reset	Description
15	0	R	0b	Not used and always set to 0. Attempts to read this bit will be ignored.
14	WPL	R/W	NVM	Write Protect Lock. Blocks writes to the standard (10h) WRITE_PROTECT and EXTENDED_WRITE_PROTECT commands. Once set, it is not removable. 0b: (10h) WRITE_PROTECT and EXTENDED_WRITE_PROTECT commands are writeable. 1b:(10h) WRITE_PROTECT and EXTENDED_WRITE_PROTECT commands are read only.
13	TRIML	R/W	NVM	Blocks writes to trim related commands (VOUT_TRIM, IMON_CAL, VOUT_SCALE_LOOP, VOUT_SCALE_MONITOR, VBOOT_OFFSET_1), including commands which set the base output voltage and are typically set to a fixed value for the devices configuration. 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
12	VOCL	R/W	NVM	Vout Command Lock. Blocks writes to commands related to setting the base output voltage (VOUT_MODE, VOUT_COMMAND) and may be changed dynamically in the application. 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
11	VOFCL	R/W	NVM	Vout Fault Configuration Lock. Blocks writes to commands related to configuration of output voltage faults (VOUT_MAX, VOUT_OV_FAULT_LIMIT, VOUT_OV_FAULT_RESPONSE, VOUT_UV_FAULT_LIMIT, VOUT_UV_FAULT_RESPONSE, VOUT_MIN). 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
10	WRNL	R/W	NVM	Warnings Lock. Blocks writes to commands related to configuration of warnings (SMBALERT_MASK, VOUT_OV_WARN_LIMIT, VOUT_UV_WARN_LIMIT, IOUT_OC_WARN_LIMIT, OT_WARN_LIMIT), including masking which faults or warnings can assert SMB_ALERT#. 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
9	IO_TEMPL	R/W	NVM	Ioutand Temperature Lock. Blocks writes to commands related to configuration of output current and temperature faults (IOUT_OC_FAULT_LIMIT, IOUT_OC_FAULT_RESPONSE, OT_FAULT_LIMIT, OT_FAULT_RESPONSE). 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
8	MRGNL	R/W	NVM	MarginLock. Blocks writes to commands related to margining the output voltage (VOUT_MARGIN_HIGH, VOUT_MARGIN_LOW, VOUT_TRANSITION_RATE). 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
7	OPL	R/W	NVM	Operation Lock. Blocks writes to the OPERATION command. 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
6	CFGL	R/W	NVM	Configuration Lock. Blocks writes to commands related to setting the device’s configuration (FREQUENCY_SWITCH, SYS_CFG_USER1, PMB_ADDR, COMP, STACK_CONFIG). 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
5	VIFCL	R/W	NVM	Vin Fault Configuration Lock. Blocks writes to commands related to configuration of input voltage faults (VIN_OV_FAULT_LIMIT). 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
4	SQNL	R/W	NVM	Sequence Lock. Blocks writes to commands related to configuration of sequencing (TON_DELAY, TON_RISE, TOFF_DELAY, TOFF_FALL, ON_OFF_CONFIG, VIN_ON, and VIN_OFF). 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
3	MFRDL	R/W	NVM	Manufacturer Data Lock. Blocks writes to manufacturer data commands (MFR_ID, MFR_MODEL, MFR_REVISION). 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
2	PSKYL	R/W	NVM	PasskeyLock. Blocks writes to the PASSKEY command. This is meant to prevent accidental or malicious attempts to set a PASSKEY on a device without one. Setting this bit will also prevent unlocking the device through the PASSKEY command. 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
1	RNVML	R/W	NVM	Restore NVM Lock. Blocks writes to the RESTORE_USER_ALL command. When RESTORE_USER_ALL is blocked, restore after power-up must still be allowed. 0b: Commands are writable unless write protected by (10h) WRITE_PROTECT. 1b:Commands are read only.
0	SNVML	R/W	NVM	Store NVM Lock. Blocks writes to the STORE_USER_ALL command. 0b: Commands are Writable unless Read Only from (10h) WRITE_PROTECT. 1b at Power on Reset or RESTORE: Commands are read only. 1b at all other times: No change until STORE, then a reset or RESTORE.