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WM8945 Datasheet(PDF) 61 Page - Wolfson Microelectronics plc |
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WM8945 Datasheet(HTML) 61 Page - Wolfson Microelectronics plc |
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61 / 169 page  Production Data WM8945 w PD, May 2011, Rev 4.1 61 LDO_VSEL [4:0] LDO OUTPUT LDO_VSEL [4:0] LDO OUTPUT 00h Vref x 1.42 10h Vref x 2.85 01h Vref x 1.50 11h Vref x 3.00 02h Vref x 1.58 12h Vref x 3.16 03h Vref x 1.66 13h Vref x 3.32 04h Vref x 1.74 14h Vref x 3.49 05h Vref x 1.82 15h Vref x 3.63 06h Vref x 1.90 16h Vref x 3.79 07h Vref x 1.97 17h Vref x 3.95 08h Vref x 2.06 18h Vref x 4.12 09h Vref x 2.13 19h Vref x 4.28 0Ah Vref x 2.21 1Ah Vref x 4.42 0Bh Vref x 2.29 1Bh Vref x 4.58 0Ch Vref x 2.37 1Ch Vref x 4.75 0Dh Vref x 2.45 1Dh Vref x 4.90 0Eh Vref x 2.53 1Eh Vref x 5.06 0Fh Vref x 2.69 1Fh Vref x 5.23 Note – Vref is the applicable voltage reference, selected by LDO_REF_SEL. Table 37 LDO Output Voltage Control BG_VSEL [4:0] BG Voltage (V) BG_VSEL [4:0] BG Voltage (V) 00h 1.200 08h 1.414 01h 1.227 09h 1.440 02h 1.253 0Ah 1.467 03h 1.280 0Bh 1.494 04h 1.307 0Ch 1.520 05h 1.334 0Dh 1.547 06h 1.360 0Eh 1.574 07h 1.387 0Fh 1.600 Table 38 Bandgap Voltage Control REFERENCE VOLTAGES AND MASTER BIAS This section describes the analogue reference voltage and bias current controls. It also describes the VMID soft-start circuit for pop suppressed start-up and shut-down. The analogue circuits in the WM8945 require a mid-rail analogue reference voltage, VMID. This reference is generated via a programmable resistor chain. Together with the external decoupling capacitor (connected to the VMIDC pin), the programmable resistor chain results in a slow, normal or fast charging characteristic on the VMID reference. This is enabled using VMID_ENA and VMID_SEL. The different resistor options controlled by VMID_SEL can be used to optimise the reference for normal operation, low power standby or for fast start-up as described in Table 39. The VMID resistor chain can be powered from the LDO output (LDOVOUT) or from the LDO supply (LDOVDD). This is selected using VMID_REF_SEL. Note that when VMID is selected as the LDO reference voltage, VMID cannot be generated from the LDOVOUT supply voltage (VMID_REF_SEL = 1) and must be generated from the LDOVDD supply voltage (VMID_REF_SEL = 0). The VMID ratio can be selected using VMID_CTRL. This selects the ratio of VMID to the supply voltage that has been selected by VMID_REF_SEL. VMID should be half of the LDOVOUT supply voltage for maximum voltage swing. In the case where VMID_REF_SEL has selected the LDOVOUT supply voltage output, then VMID_CTRL should select the ratio “1/2”. In the case where VMID_REF_SEL has selected the LDOVDD supply voltage, then the alternate ratio “5/11” may be preferred provided LDOVDDD = 3.3V and LDOVOUT = 3.0V. |
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