WM8351GEB/V Wolfson Microelectronics, WM8351GEB/V Datasheet - Page 159

• Manufacturer Part Number: WM8351GEB/V
• Description: Audio CODECs Audio CODEC plus pwr management
• Manufacturer: Wolfson Microelectronics

Specifications of WM8351GEB/V

• Number Of Adc Inputs: 2
• Number Of Dac Outputs: 2
• Conversion Rate: 48 KSPS
• Interface Type: Serial (2-Wire, 3-Wire, 4-Wire)
• Resolution: 12 bit
• Operating Supply Voltage: 3.7 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: BGA
• Minimum Operating Temperature: - 25 C
• Number Of Channels: 2 ADC/2 DAC
• Supply Current: 260 uA
• Thd Plus Noise: - 83 dB
• Audio Codec Type: Stereo
• No. Of Adcs: 2
• No. Of Dacs: 2
• No. Of Input Channels: 8
• No. Of Output Channels: 6
• Adc / Dac Resolution: 24bit
• Adcs / Dacs Signal To Noise Ratio: 95dB
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
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If the USB current limit cannot support the charge current demanded by CHG_TRICKLE_SEL and
USB current choking is enabled, then the charge current will be modified, where possible, in order to
continue charging. The trickle charge current cannot be controlled dynamically - the only possible
charge currents are 50mA or 100mA. Therefore, the only form of USB choking in trickle charge mode
is for a demanded current of 100mA to be reduced to 50mA. Trickle charge USB current choking is
controlled by the CHG_TRICKLE_USB_CHOKE register bit. The time constant for the charger’s
attempts to increase the current after USB choking can be controlled by CHG_RECOVERY_T.
The register control fields for Trickle Charging are described in Table 104. See Section 17.7.5 for
details of battery charger termination.
R168 (A8h)
Battery charger
control 1
R169 (A9h)
Battery charger
control 2
R170 (AAh)
Battery charger
control 3
Table 104 Trickle Charging Control
ADDRESS
BIT
9
8
7
6
7
CHG_TRICKLE
_TEMP_CHOK
E
CHG_TRICKLE
_USB_CHOKE
CHG_RECOVE
R_T
CHG_TRICKLE
_SEL
CHG_FRC
LABEL
DEFAULT
0
0
0
0
0
Enable trickle charge temperature
choking
0 = disable
1 = enable
Protected by security key.
Enable USB current choking in trickle
charge
0 = disable
1 = enable
Protected by security key.
Time constant adjust for charger choke
recovery (step-up):
0 = Step-up time constant is 180us
(allows faster recovery between
processor wakeups)
1 = Step-up time constant is >20ms
(outside audio band)
Protected by security key
Selects the trickle charge current.
0 = Set the trickle charge current to
50mA.
1 = Set the trickle charge current to
100mA.
Protected by security key.
Allows trickle-charging to be forced even
if the battery voltage is above the default
threshold
0 = only trickle-charge if the battery
voltage is below CHG_VSEL - 100mV
1 = always trickle-charge
Protected by security key.
DESCRIPTION
PD, March 2010, Rev 4.2
WM8351
159