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MC13110A Datasheet(PDF) 48 Page - Motorola, Inc |
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MC13110A Datasheet(HTML) 48 Page - Motorola, Inc |
48 / 68 page ![]() MC13110A/B MC13111A/B 48 MOTOROLA ANALOG IC DEVICE DATA Power Saving Operating Modes When the MC13110A/B or MC13111A/B are used in a handset, it is important to conserve power in order to prolong battery life. There are five modes of operation for the MC13110A/MC13111A; Active, Rx, Standby, Interrupt, and Inactive. The MC13110B/MC13111B has three modes of operation. They are Active, Rx, and Standby. In the Active mode, all circuit blocks are powered. In the Rx mode, all circuitry is powered down except for those circuit sections needed to receive a transmission from the base. In the Standby and Interrupt Modes, all circuitry is powered down except for the circuitry needed to provide the clock output for the microprocessor. In the Inactive Mode, all circuitry is powered down except the MPU serial interface. Latch memory is maintained in all modes. All mode functions are the same for the MC13110B/MC13111B, except that there is no Inactive mode. With the B” version the MPU Clock is always running so that there can never be a register reset if the memory is disturbed. Figure 118 shows the control register bit values for selection of each power saving mode and Figure 118 shows the circuit blocks which are powered in each of these operating modes. Figure 117. Power Saving Mode Selection Stdby Mode Bit Rx Mode Bit “CD Out/ Hardware Interrupt” Pin Power Saving Mode MC13110A/MC13111A 0 0 X Active 0 1 X Rx 1 0 X Standby 1 1 1 or High Impedance Inactive 1 1 0 Interrupt MC13110B/MC13111B [Note 14] 0 0 X Active 0 1 X Rx 1 X X Standby 1 1 0 Interrupt NOTES: 13. “X” is a don’t care 14. MPU Clock Out is ”Always On” Figure 118. Circuit Blocks Powered During Power Saving Modes Ci i Bl k MC13110A/MC13111A Ci i Bl k MC13110B/MC13111B Circuit Blocks Active Rx Standby Inactive “PLL Vref” Regulated Voltage X X X1 X1, 2 MPU Serial Interface X X X X2 2nd LO Oscillator X X X MPU Clock Output X X X RF Receiver and 1st LO VCO X X Rx PLL X X Carrier Detect X X Data Amp X X Low Battery Detect X X Tx PLL X Rx and Tx Audio Paths X NOTES: 15. In Standby and Inactive Modes, “PLL Vref” remains powered but is not regulated. It will fluctuate with VCC. 16. There is no Inactive mode for MC13110B/MC13111B. Power Saving Application – Option 1 (MC13110B and MC13111B Only) When the handset is in standby, power can be reduced by entering a “low power” mode and periodically switching to “sniff” mode to check for incoming calls. Figure 119. shows an application where the “Clk Out” pin provides the clock for the MPU. In this application, the 2nd LO and MPU clock run continuously. The MPU maintains control at all times and sets the timing for transitions into the “sniff” mode. Power is saved in the low power mode by putting the MC13110B/MC13111B into its “Standby” mode. Only the 2nd LO and MPU clock divider are active. By programming the MPU clock divider to a large divide value of 20, 80, or 312.5 this will reduce the MPU clock frequency and save power in the MPU. |
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Similar Description - MC13110A |
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