WM8311GEB/V Wolfson Microelectronics, WM8311GEB/V Datasheet - Page 120

• Manufacturer Part Number: WM8311GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 121BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8311GEB/V

• Supply Voltage: 5.5V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 7
• Digital Ic Case Style: BGA
• No. Of Pins: 121
• No. Of Regulated Outputs: 9
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

WM8311
18.4 DIGITAL COMPARATORS
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Table 67 AUXADC Readback
The WM8311 has four digital comparators which may be used to compare AUXADC measurement
data against programmable threshold values. Each comparator has a status bit, and also an
associated interrupt flag (described in Section 18.5), which indicates that the associated data is
beyond the threshold value.
The digital comparators are enabled using the DCMPn_ENA register bits as described in Table 66.
After an AUXADC conversion, the measured value is compared with the threshold level of any
associated comparator(s). Note that this comparison is only performed following a conversion.
The source data for each comparator is selected using the DCMPn_SRC register bits; this selects
one of eight possible AUXADC channels for each comparator. If required, the same AUXADC
channel may be selected for more than one comparator; this would allow more than one threshold to
be monitored on the same AUXADC channel. Note that the coding of the 000b value of the
DCMPn_SRC fields differs between the four comparators.
The DCMPn_GT register bits select whether the status bit and associated interrupt flag will be
asserted when the measured value is above the threshold or when the measured value is below the
threshold. The output of the most recent threshold comparison is indicated in the DCOMPn_STS
fields.
The threshold DCMPn_THR is a 12-bit code for each comparator. This field follows the same voltage
or temperature coding as the associated AUXADC channel source (see Section 18.3).
R16432 (4030h)
Comparator
Control
ADDRESS
ADDRESS
11:0
BIT
BIT
11
10
9
8
AUX_DATA [11:0]
DCOMP4_STS
DCOMP3_STS
DCOMP2_STS
DCOMP1_STS
LABEL
LABEL
DEFAULT
DEFAULT
000h
0
0
0
0
AUXADC Measurement Data
Voltage (mV) = AUX_DATA x 1.465
ChipTemp (°C) = (512.18 -
AUX_DATA) / 1.0983
BattTemp (°C) = (value is dependent
on NTC thermistor)
Digital Comparator 4 status
0 = Comparator 4 threshold not
detected
1 = Comparator 4 threshold
detected
(Trigger is controlled by
DCMP4_GT)
Digital Comparator 3 status
0 = Comparator 3 threshold not
detected
1 = Comparator 3 threshold
detected
(Trigger is controlled by
DCMP3_GT)
Digital Comparator 2 status
0 = Comparator 2 threshold not
detected
1 = Comparator 2 threshold
detected
(Trigger is controlled by
DCMP2_GT)
Digital Comparator 1 status
0 = Comparator 1 threshold not
detected
1 = Comparator 1 threshold
detected
PP, December 2009, Rev 3.0
DESCRIPTION
DESCRIPTION
Pre-Production
120