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WM8310 Datasheet(PDF) 101 Page - Wolfson Microelectronics plc |
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WM8310 Datasheet(HTML) 101 Page - Wolfson Microelectronics plc |
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101 / 291 page  Pre-Production WM8310 w PP, May 2012, Rev 3.1 101 ADDRESS BIT LABEL DEFAULT DESCRIPTION R16462 (404Eh) Current Sink 1 5:0 CS1_ISEL 00 0000 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. R16463 (404Fh) Current Sink 2 5:0 CS2_ISEL 00 0000 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. Table 49 Controlling the Sink Current for ISINK1 and ISINK2 16.2.3 ON/OFF RAMP TIMING 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. ADDRESS BIT LABEL DEFAULT DESCRIPTION R16462 (404Eh) Current Sink 1 11:10 CS1_OFF_RA MP 01 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. 9:8 CS1_ON_RAM P 01 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. |
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