CS5535 datasheet(496/555 Pages) NSC

496 / 555 page

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496

Revision 0.8

PMC Register Descriptions (Continued)

5.18.3.15 PM Thermal-Safe Delay and Enable (PM_TSD)

Reads always return the value written, except for RSVD bits [29:20].

PM_FSD Register Map

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9876543210

RSVD

PWRBUT_DELAY

PM_FSD Bit Descriptions

Bit

Name

Description

PWRBUT_LOCK

Power Button Lock. After this bit is set, the value in this register can not be changed

until RESET_STAND# is applied.

PWRBUT_EN

Power Button Enable. Must be high to enable the fail-safe function.

29:20

RSVD

Reserved. By convention write 0, but may write anything. Reads return 0.

19:0

PWRBUT_DELAY

Power Button Delay. If the Power Button (PWR_BUT#) input signal is asserted for

PWRBUT_DELAY number of 32 kHz clock edges, then unconditionally de-assert

WORKING and WORK_AUX to remove Working power. If PWR_BUT# is still asserted

at wakeup, hold in Standby state until de-asserted.

PWR_BUT# needs to be asserted for at least one 32 kHz clock edge for this function to

work properly. A less than one 32 kHz clock edge pulse on PWR_BUT# may not be

registered.

The delay restarts if PWR_BUT# de-asserts and then asserts again. If PWR_BUT# is

already asserted, the delay restarts anytime PWRBUT_DELAY (this field) is written.

PMS I/O Offset

44h

Type

R/W

Reset Value

00000000h

PM_TSD Register Map

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9876543210

RSVD

THRM_DELAY

PM_TSD Bit Descriptions

Bit

Name

Description

THRM_LOCK

Thermal Lock. After this bit is set, the value in this register can not be changed until

RESET_STAND# is applied.

THRM_EN

Thermal Enable. Must be high to enable the thermal alarm function.

29:20

RSVD

Reserved. By convention write 0, but may write anything. Reads return 0 value.

CS5535 Datasheet(PDF) 496 Page - National Semiconductor (TI)

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