WM9715L datasheet(49/77 Pages) WOLFSON

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WM9715L

PD Rev 4.0 December 2007

The WM9715L has two on-chip comparators that can be used to implement a battery alarm function,

or other functions such as a window comparator. Each comparator has one of its inputs tied to any

one of three device pins and the other tied to a voltage reference. The voltage reference can be

either internally generated (VREF = AVDD/2) or externally connected on AUX4 (pin 12).

The comparator output signals can be used to send an interrupt to the CPU via the GENIRQ pin,

and / or to wake up the WM9715L from sleep mode (see “Interrupt Control” for details).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

CP1

COMP1 Polarity (see also “Interrupt Control”)

0: Alarm when COMP1 voltage is below VREF

1: Alarm when COMP1 voltage is above VREF

4Eh

CP2

COMP2 Polarity (see also “Interrupt Control”)

0: Alarm when COMP2 voltage is below VREF

1: Alarm when COMP2 voltage is above VREF

58h

15:13

COMP2

DEL

Low Battery Alarm Delay

000: No delay

001: 0.17s (213 = 8192 AC-Link frames)

010: 0.34s (2

14 = 16384 AC-Link frames)

011: 0.68s (215 = 32768 AC-Link frames)

100: 1.4s (216 = 65536 AC-Link frames)

101: 2.7s (2

17 = 131072 AC-Link frames)

110: 5.5s (218 = 262144 AC-Link frames)

111: 10.9s (219 = 524288 AC-Link frames)

Table 32 Comparator Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Comparator 1 Reference Voltage

VREF = AVDD/2

C1REF

WIPER/AUX4 (pin 12)

Comparator 1 Signal Source

AVDD/2 when C1REF=’1’. Otherwise

comparator 1 is powered down

COMP1/AUX1 (pin 29)

COMP2/AUX2 (pin 30)

13:12

C1SRC

BMON/AUX3 (pin 31)

Comparator 2 Reference Voltage

VREF = AVDD/2

C2REF

WIPER/AUX4 (pin 12)

Comparator 2 Signal Source

AVDD/2 when C2REF=’1’. Otherwise

comparator 2 is powered down

COMP1/AUX1 (pin 29)

COMP2/AUX2 (pin 30)

5Ch

Additional

Analogue

Functions

10:9

C2SRC

BMON/AUX3 (pin 31)

Table 33 Comparator Reference and Source Control

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