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MC13110A Datasheet(PDF) 49 Page - Motorola, Inc |
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MC13110A Datasheet(HTML) 49 Page - Motorola, Inc |
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49 / 68 page  MC13110A/B MC13111A/B 49 MOTOROLA ANALOG IC DEVICE DATA Power Saving Application – Option 2 (MC13110A and MC13111A Only) In some handset applications it may be desirable to power down all circuitry including the microprocessor (MPU). First put the MC13110A/MC13111A into the Inactive mode. This turns off the MPU Clock Output (see Figure 120) and disables the microprocessor. Once a command is given to switch the IC into an “Inactive” mode, the MPU Clock output will remain active for a minimum of one reference counter cycle (about 200 µs) and up to a maximum of two reference counter cycles (about 400 µs). This is performed in order to give the MPU adequate time to power down. An external timing circuit should be used to initiate the turn–on sequence. The “CD Out” pin has a dual function. In the Active and Rx modes it performs the carrier detect function. In the Standby and Inactive modes the carrier detect circuit is disabled and the “CD Out” pin is in a “High” state, because of an external pull–up resistor. In the Inactive mode, the “CD Out” pin is the input for the hardware interrupt function. When the “CD Out” pin is pulled “low”, by the external timing circuit, the IC switches from the Inactive to the Interrupt mode. Thereby turning on the MPU Clock Output. The MPU can then resume control of the IC. The “CD Out” pin must remain low until the MPU changes the operating mode from Interrupt to Standby, Active, or Rx modes. Figure 119. Power Saving Application – Option 1 Timer MPU Clk Divider Clk In SPI Port Clk Out SPI Port LO2 Out LO2 In MC13110B MC13111B Microprocessor Mode MPU Timer MPU Clock Out “Low Power” “Sniff” Standby Mode Rx Mode 32.8, 128 or 512 kHz 4.0 MHz |
Similar Part No. - MC13110A |
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Similar Description - MC13110A |
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