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WM8352 bảng dữ liệu(PDF) 170 Page - Wolfson Microelectronics plc

tên linh kiện WM8352
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WM8352 bảng dữ liệu(HTML) 170 Page - Wolfson Microelectronics plc

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WM8352
Production Data
w
PD, February 2011, Rev 4.4
170
19 AUXILIARY ADC
19.1 GENERAL DESCRIPTION
The WM8352 incorporates a low-power 12-bit Auxiliary ADC (AUXADC). This can be used to
measure a number of internal or external voltages, with either VREF or VRTC as its reference. A
programmable potential divider enables the AUXADC to measure voltages higher than the reference.
Note that the AUX1 pin is also the input for the battery pack temperature monitoring circuit and is
therefore not freely available for other analogue inputs. The battery NTC input can still be sampled
and readback via AUX1 in the same way as the other AUXADC inputs. The AUX1 pin may be used
for other purposes if the NTC detection is disabled and/or the associated Battery Charger interrupts
are masked. See Section 17.7 for details of the battery pack NTC functions.
The AUXADC circuit is illustrated in Figure 78.
Figure 78 Auxiliary ADC
The AUXADC is enabled using the AUXADC_ENA register bit as described in Table 114.
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R12 (0Ch) Power
Mgmt (5)
7
AUXADC_ENA
0
AUXADC control
0 = disabled
1 = enabled
R144 (90h)
Digitizer Control
(1)
15
Note: AUXADC_ENA can be accessed through R12 or through R144. Reading from or writing to
either register location has the same effect.
Table 114 AUXADC Enable



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