wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 66

• Manufacturer Part Number: wm9714l
• Description: Ac?97 Audio Codec
• Manufacturer: Wolfson Microelectronics plc

WM9714L
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MEASUREMENT TYPES
The ADCSEL control bits determine which type of measurement is performed (see below).
Table 48 AUX ADC Control (Measurement Types)
The WM9714L performs a single measurement – either in polling mode or continuously, as indicated
by the CTC bit. The type of measurement is specified by the ADCSEL[7:4] bits. Only one of the
ADCSEL[7:4] bits should be set.
CONVERSION RATE
The AUXADC conversion rate is specified by the CR bits (reg 76h).
CR may be set to 93.75Hz (every 512 AC-Link Frames), 120Hz (every 400 AC-Link Frames),
153.75Hz (every 312 AC-Link frames) or 187.5Hz (every 256 AC-Link frames).
If only one ADRSEL[7:1] bit is set then each individual conversion occurs at the rate specified by
CR.
If multiple ADRSEL[7:1] bits are set then the complete set of conversions requested is completed at
the rate specified by CR.
74h
Note: Only one bit in 74h[7:4] should be set at any one time
REGISTER
ADDRESS
7
6
5
4
BIT
ADCSEL_AUX4
ADCSEL_AUX3
ADCSEL_AUX2
ADCSEL_AUX1
LABEL
0
0
0
0
DEFAULT
AUX4 Measurement Enable Control
0 = Disable AUX4 measurement (pin 12)
1 = Enable AUX4 measurement (pin 12)
AUX3 Measurement Enable Control
0 = Disable AUX3 measurement
(SPKVDD/3)
1 = Enable AUX3 measurement
(SPKVDD/3)
AUX2 Measurement Enable Control
0 = Disable AUX2 measurement (pin 30)
1 = Enable AUX2 measurement (pin 30)
AUX1 Measurement Enable Control
0 = Disable AUX1 measurement (pin 29)
1 = Enable AUX1 measurement (pin 29)
PP, Rev 3.2, October 2008
DESCRIPTION
Pre-Production
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