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STW8019 数据表(PDF) 16 Page - STMicroelectronics |
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STW8019 数据表(HTML) 16 Page - STMicroelectronics |
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16 / 55 page  Functional description STw8009/STw8019 16/55 4.12.2 Mode transition diagram The following mode transition diagram shows the main possible transitions between the modes and the actions. Figure 12. Mode transition diagram Transitions to OFF mode The possible transitions are indicated in Figure 12: Mode transition diagram10 in dotted lines. No internal data needs to be saved and the STw8009/STw8019 can be turned OFF from any mode. The only restriction is to comply with the power supply rules described here after. Transition from OFF mode to Sleep mode then to Active mode Power up must be done by starting from OFF to Sleep mode and then from Sleep to Active mode. Sleep to Standby is not possible. Following the transition from OFF to Sleep mode, STw8009/STw8019 must receive PORn signal (Power On Reset) to initialize the Control and power Management Unit registers (Reg 128 to 132). The host sends the order for the STw8009/STw8019 to switch from Sleep to Active mode by releasing Suspend ball and enabling pixel clock (27 MHz). The device then generates a reset sequence to the DENC part. OFF Sleep Standby Active Registers maintained Power consumption reduced DENC clock gated DACs in low power Normal operation All functions available DACs dynamically used on demand No Power supply applied Registers values lost All supplies are applied but STw8009 suspend is asserted Register values lost DAC in low power mode STw8009 looses all its registers and configuration when entering Sleep mode A PORn reset occurs after the 1.2 V & 1.8 V have been applied No need to reset or reconfigure DENC in either direction Suspend = « 0 » By Sw Suspend = « 1 » OFF Sleep Standby Active Registers maintained Power consumption reduced DENC clock gated DACs in low power Normal operation All functions available DACs dynamically used on demand No Power supply applied Registers values lost All supplies are applied but STw8009 suspend is asserted Register values lost DAC in low power mode STw8009 looses all its registers and configuration when entering Sleep mode STw8009 looses all its registers and configuration when entering Sleep mode A PORn reset occurs after the 1.2 V & 1.8 V have been applied No need to reset or reconfigure DENC in either direction No need to reset or reconfigure DENC in either direction Suspend = « 0 » By Sw Suspend = « 1 » |
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