AS3517H-ECTP datasheet(90/94 Pages) AMSCO

90 / 94 page

AS3517 V17

Data Sheet, Confidential

www.austriamicrosystems.com

Table 91 RTCV Register

Name

Base

Default

RTCV

2-wire serial

23h

RTC Voltage Register

Offset: 28h

This register is reset at a DVDD-POR.

Bit

Bit Name

Default

Access

Bit Description

7:4

V_RVDD

0010

R/W

Selects the RVDD output voltage level (1V to 2.5V)

Default: 1.2V

RVDD= 1V + V_RVDD*0.1V

3:2

RTC_ON

R/W

RTC counter clock control:

0: Disable clock for RTC counter

1: Enables clock for RTC counter

OSC32_ON

R/W

Switches the 32kHz oscillator ON A 32kHz watch crystal need

to be connected to pins XIN32/XOUT32

0: Disable 32kHz oscillator

1: Enables 32kHz oscillator

Table 92 RTCV Register

Name

Base

Default

RTCT

2-wire serial

40h

RTC Timing Register

Offset: 29h

This register is reset at a RVDD-POR.

Bit

Bit Name

Default

Access

Bit Description

IRQ_MIN

R/W

0: generates an interrupt every second

1: generates an interrupt every minute

The interrupt has to be enable in IRQ_ENRD_4 (27h)

6:0

RTC_TBC<6:0>

1000000

R/W

These bits are used to correct the inaccuracy of the used

32kHz crystal.

Trimming register for RTC, 128 steps @ 7.6ppm

000000: 1 (7.6ppm)

000001: 2 (15.2ppm)

…

100000: 64 (488ppm)

…

111110: 126 (960.8ppm)

111111: 127 (968.4ppm)

Table 93 RTC_0 to RTC_3 Register

Name

Base

Default

RTC_0 to RTC_3

2-wire serial

00 00 00 00h

RTC Time-base Seconds Register

Offset: 2Ah to 2Dh

This register is reset at a RVDD-POR.

Adr.

Byte Name

Default

Access

Bit Description

2Ah

RTC_0

00h

R/W

QRTC<7:0>; RTC seconds bits 0 to 7

2Bh

RTC_1

00h

R/W

QRTC<15:8>; RTC seconds bits 8 to 15

2Ch

RTC_2

00h

R/W

QRTC<23:9>; RTC seconds bits 9 to 23

2Dh

RTC_3

00h

R/W

QRTC<31:24>; RTC seconds bits 24 to 31

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