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WM8961GEFL/V Datasheet(PDF) 79 Page - Wolfson Microelectronics plc |
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WM8961GEFL/V Datasheet(HTML) 79 Page - Wolfson Microelectronics plc |
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79 / 116 page  WM8961 Pre-Production w PP, August 2009, Rev 3.1 79 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R25 (19h) Power Management (1) 8:7 VMIDSEL 00 VMID Divider Enable and Select 00 = VMID disabled (for OFF mode) 01 = 2 x 50k Ω divider enabled (for normal playback / record) 10 = 2 x 250k Ω divider enabled (for low-power standby) 11 = 2 x 5k Ω divider enabled (for fast start-up) 6 VREF 0 Enable master bias current source 0 = Master bias current source disabled 1 = Master bias current source enabled R28 (1Ch) Anti-pop 4 BUFDCOPEN 0 Enables fast startup bias generation 3 BUFIOEN 0 Internal VMID and fast bias enable 2 SOFT_ST 0 For anti-pops and clicks. VMID Slow start up. Ramp up voltage 0 = function disabled 1 = slow VMID slew rate selected Table 62 VMIDSEL Control Registers The BUFDCCOPEN and BUFIOEN are used internally to enable the internal VMID and to enable the internal fast start-up bias current. Users should enable both (set them to 1). The SOFT_ST bit can be used to give a slow VMID ramp up voltage to reduce possibility of pops and clicks at start-up. THERMAL SHUTDOWN AND STATUS The speaker outputs can drive very large currents. To protect the WM8961 from overheating a thermal shutdown circuit is included. If the device temperature reaches approximately 150 0C and the thermal shutdown circuit is enabled (TSDEN = 1; TSENSEN = 1) the speaker amplifiers (SPK_LP, SPK_LN, SPK_RP and SPK_RN) will be disabled. TSENSEN must be set to 1 to enable the temperature sensor when using the TSDEN thermal shutdown function. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R23 (17h) Additional Control (1) 8 TSDEN 1 Thermal Shutdown Enable 0 = Thermal shutdown disabled 1 = Thermal shutdown enabled (TSENSEN must be enabled for this function to work) R48 (30h) Additional Control (4) 1 TSENSEN 1 Temperature Sensor Enable 0 = Temperature sensor disabled 1 = Temperature sensor enabled Table 63 Thermal Shutdown In addition to the thermal shutdown registers, there are 2 status (read only) registers which can be used to check the status of the temperature sensor. These are the TEMP_WARN and TEMP_SHUT status bits REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R47 (2Fh) Pwr Mgmt (3) 1 TEMP_SHUT 0 Read only status of temperature sensor triggers at 145 degrees C 0 TEMP_WARN 0 Read only status of temperature sensor – triggers at 125 degrees C Table 64 Thermal Status |
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