ACT5880 datasheet(18/87 Pages) ACTIVE-SEMI

18 / 87 page

ACT5880

Rev 2, 03-Sep-13

- 18 -

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BLOCK

ADDRESS

and BIT

NAME

DEFAULT

and

ACCESS

DESCRIPTION

SYS

0x00

TRST

W/R

Reset Timer Setting. Defines the reset time-out threshold. Reset

time-out is 65ms when value is 1, reset time-out is 260ms when

value is 0.

nSYSMODE

W/R

SYSLEV Mode Select. Defines the response to the SYSLEV

voltage detector, 0: automatic shut down when VVSYS falls below

the programmed VSYSLEV threshold, 1: Generate an interrupt

when VVSYS falls below the programmed VSYSLEV threshold.

nSYSLVMSK

W/R

System Voltage Level Interrupt Mask. SYSLEV interrupt is

masked by default, set to 1 to unmask this interrupt.

nSYSSTAT

VVSYS Status Indication. Value is 0 when VVSYS > VSYSLEV,

value is 1 when VVSYS < VSYSLEV.

SYSLEV[3]

W/R

4 bits to set the threshold of VSYSLEV. SYSLEV[3:0] = 0000 is for

2.2V. The voltage is linear coded with LSB for 0.1V in the range

of 2.2V to 3.7V, where LSB is SYSLEV[0]. The hysteresis is

0.2V in rising.

The setting is effective only when VVSYS > VUVLO.

SYSLEV[2]

SYSLEV[1]

SYSLEV[0]

0x01

EVENT1

WE/R For internal use only.

EVENT2

WE/R For internal use only.

EVENT4

W/R

Write 1 to enable the sleep mode of REG2, 0 to enable the

normal buck mode operation of REG2.

RFU

WE/R For internal use only.

SCRATCH[3]

W/R

4 bits scratch register for the equipment system to use. Data in

those bits are kept until the VSYS loses.

SCRATCH[2]

SCRATCH[1]

SCRATCH[0]

0x3C

[

7:0]

W/R

Set to 0x80 before setting nWKALM and RAAI.

0x3D

[

7:0]

Set to 0x08 before setting nWKALM and RAAI.

Note:

W/R: Write and read accessible. R: Read accessible, writing to the bit does not make change to the volume. WE/R: Write

and read accessible, write exact what it is before to avoid unexpected behavior. X is uncertain volume.

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