WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 98

• 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

WM8310
w
R16462
(404Eh)
Current Sink 1
R16463
(404Fh)
Current Sink 2
Table 49 Controlling the Sink Current for ISINK1 and ISINK2
16.2.3
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. This can be used in order to switch the LEDs on
or off gradually. The ramp durations are programmed using the register bits defined in Table 50.
R16462
(404Eh)
Current Sink 1
R16463
(404Fh)
ADDRESS
ADDRESS
ON/OFF RAMP TIMING
11:10
11:10
BIT
9:8
BIT
5:0
5:0
CS1_OFF_RA
MP
CS1_ON_RAM
P
CS2_OFF_RA
MP
CS1_ISEL
CS2_ISEL
LABEL
LABEL
DEFAULT
DEFAULT
00 0000
00 0000
01
01
01
ISINK1 current.
Current = 2.0μA × 2^(CS1_ISEL/4),
where CS1_ISEL is an unsigned binary
number.
Alternatively,
CS1_ISEL = 13.29 x LOG(current/2.0μA)
00_0000 = 2.0μA
11_0111 = 27.6mA
Values greater than 11_0111 will result
in the maximum current of approx
27.6mA.
ISINK2 current.
Current = 2.0μA × 2^(CS2_ISEL/4),
where CS2_ISEL is an unsigned binary
number.
Alternatively,
CS2_ISEL = 13.29 x LOG(current/2.0μA)
00_0000 = 2.0μA
11_0111 = 27.6mA
Values greater than 11_0111 will result
in the maximum current of approx
27.6mA.
ISINK1 Switch-Off ramp
00 = instant (no ramp)
01 = 1 step every 4ms (220ms)
10 = 1 step every 8ms (440ms)
11 = 1 step every 16ms (880ms)
The time quoted in brackets is valid for
the maximum change in current drive
setting. The actual time scales
according to the extent of the change in
current drive setting.
ISINK1 Switch-On ramp
00 = instant (no ramp)
01 = 1 step every 4ms (220ms)
10 = 1 step every 8ms (440ms)
11 = 1 step every 16ms (880ms)
The time quoted in brackets is valid for
the maximum change in current drive
setting. The actual time scales
according to the extent of the change in
current drive setting.
ISINK2 Switch-Off ramp
00 = instant (no ramp)
PP, December 2009, Rev 3.0
DESCRIPTION
DESCRIPTION
Pre-Production
98