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MC13110A Datasheet(PDF) 48 Page - Motorola, Inc

Part # MC13110A
Description  UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC13110A Datasheet(HTML) 48 Page - Motorola, Inc

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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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