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WM8352 Datasheet(PDF) 127 Page - Wolfson Microelectronics plc |
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WM8352 Datasheet(HTML) 127 Page - Wolfson Microelectronics plc |
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127 / 336 page  Production Data WM8352 w PD, February 2011, Rev 4.4 127 14.6.2 CLOCKING The DC-DC converters are controlled by an internally generated clock signal from the RC Oscillator with a constant frequency of around 2.0MHz for DC-DC 1, 3, 4 and 6, and a constant frequency of around 1.0MHz for DC-DC 2 and 5. 14.6.3 DC-DC BUCK (STEP-DOWN) CONVERTER CONTROL DC-DC Converters 1, 3, 4 and 6 are buck converters which can be configured to operate in different operating modes using the register bits described in Table 72. In Active mode, the DC-DC Converters operate to their highest level of performance. The DC-DC Converters will automatically select PWM or Pulse-Skipping operation according to the load condition. This enables the power efficiency to be maximised across a wide range of load conditions. It is possible to force the Converters to use the higher performance PWM mode; in this mode, pulse- skipping is disabled and the output voltage is regulated by switching at a constant frequency which improves the transient response at light loads. In Standby/Hysteretic Mode, the DC-DC Converters disable some of the internal control circuitry in order to reduce power consumption. The load regulation may be degraded in this mode of operation. The efficiency data in Section 9.2.1 shows the conditions under which Standby Mode can offer better efficiency than Active Mode. In LDO Mode, the DC-DC Converters are reconfigured as low power LDOs. When DCn_SLEEP = 0, the corresponding DCn_ACTIVE register bit selects between Active and Standby/Hysteretic modes for the associated DC-DC converter. The DCn_SLEEP register bits control the selection of LDO Mode. Setting DCn_SLEEP = 1 selects LDO Mode. This bit takes precedence over the corresponding DCn_ACTIVE bit. ADDRESS BIT LABEL DEFAULT DESCRIPTION R177 (B1h) DC-DC Active Options 0 DC1_ACTIVE 1 DC-DCn Active mode 0 = Select Standby mode 1 = Select Active mode 2 DC3_ACTIVE 1 3 DC4_ACTIVE 1 5 DC6_ACTIVE 1 R178 (B2h) DC-DC Sleep Options 0 DC1_SLEEP 0 DC-DCn Sleep Mode 0 = Normal DC-DC operation 1 = Select LDO mode 2 DC3_SLEEP 0 3 DC4_SLEEP 0 5 DC6_SLEEP 0 Note: n is either 1, 3, 4 or 6 and identifies the individual DC-DC converter R248 (F8h) DCDC1 Test Controls 4 DC1_FORCE_ PWM 0 Force DC-DC1 PWM mode 0 = Normal DC-DC operation 1 = Force DC-DC PWM mode R250 (FAh) DCDC3 Test Controls 4 DC3_FORCE_ PWM 0 Force DC-DC3 PWM mode 0 = Normal DC-DC operation 1 = Force DC-DC PWM mode R251 (FBh) DCDC4 Test Controls 4 DC4_FORCE_ PWM 0 Force DC-DC4 PWM mode 0 = Normal DC-DC operation 1 = Force DC-DC PWM mode R253 (FDh) DCDC4 Test Controls 4 DC6_FORCE_ PWM 0 Force DC-DC6 PWM mode 0 = Normal DC-DC operation 1 = Force DC-DC PWM mode Table 72 Operating Mode Control for DC-DC Converters 1, 3, 4 and 6 |
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