WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 97

• Manufacturer Part Number: WM8310GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 169BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8310GEB/V

• Supply Voltage: 7V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 11
• Digital Ic Case Style: BGA
• No. Of Pins: 169
• No. Of Regulated Outputs: 13
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Pre-Production
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When the Current Sinks output drive is enabled or disabled using CS1_DRIVE or CS2_DRIVE, the
current ramps up or down at a programmable rate. The ramp durations are programmed using the
register bits defined in Section 16.2.3. If the current ramp is not required when switching off DC-DC4
and the Current Sinks, then the following switch-off sequence may be used:
•
•
When the Current Sinks are enabled, the status of each is indicated using the CSn_STS bits. If the
Current Sinks are unable to sink the demanded current (eg. if the power source is too low or if the
load is open circuit), then the respective CSn_STS bit will be set to 1. When the Current Sink circuit
is correctly regulated, then the respective CSn_STS bits are set to 0.
R16462
(404Eh)
Current Sink 1
R16463
(404Fh)
Current Sink 2
Table 48 Enabling ISINK1 and ISINK2
16.2.2
The sink currents for ISINK1 and ISINK2 can be independently programmed by writing to the
CS1_ISEL and CS2_ISEL register bits. The current steps are logarithmic to match the logarithmic
light sensitivity characteristic of the human eye. The step size is 1.51dB (i.e. the current doubles
every four steps).
Note that the maximum programmable sink current is 27.6mA. The maximum current that can be
supported by the DC-DC4 Boost Converter varies with the output voltage; the maximum ISINK
current that can be supported by the Boost Converter will depend upon the forward voltage required
by the current sink load(s).
ADDRESS
Disable Boost Converter (DC4_ENA = 0)
Disable Current Sink and Current Drive (CSn_ENA = 0; CSn_DRIVE = 0)
PROGRAMMING THE SINK CURRENT
BIT
15
14
13
12
15
14
13
12
CS1_ENA
CS1_DRIVE
CS1_STS
CS1_SLPENA
CS2_ENA
CS2_DRIVE
CS2_STS
CS2_SLPENA
LABEL
DEFAULT
0
0
0
0
0
0
0
0
Current Sink 1 Enable (ISINK1 pin)
0 = Disabled
1 = Enabled
Note - this bit is reset to 0 when the OFF
power state is entered.
Current Sink 1 output drive enable
0 = Disabled
1 = Enabled
Current Sink 1 status
0 = Normal
1 = Sink current cannot be regulated
Current Sink 1 SLEEP Enable
0 = Disabled
1 = Controlled by CS1_ENA
Current Sink 2 Enable (ISINK2 pin)
0 = Disabled
1 = Enabled
Note - this bit is reset to 0 when the OFF
power state is entered.
Current Sink 2 output drive enable
0 = Disabled
1 = Enabled
Current Sink 2 status
0 = Normal
1 = Sink current cannot be regulated
Current Sink 2 SLEEP Enable
0 = Disabled
1 = Controlled by CS2_ENA
PP, December 2009, Rev 3.0
DESCRIPTION
WM8310
97