MC13109A
ELECTRICAL CHARACTERISTICS (continued)
Low Battery Detect
An external resistor divider is connected to the “Ref” input
pin to set the threshold for the low battery detect. The voltage
at the “Ref” input pin is compared to an internal 1.23 V
Bandgap reference voltage. The “BD Out” pin is open
collector and requires and external pull–up resistor to VCC.
(Test Conditions: VCC = 2.6 V, TA = 25°C.)
Characteristic
Average Threshold
Voltage
Hysteresis
Condition
Take average of rising
and falling threshold
–
Input Current
Output High Voltage
Output Low Voltage
Vin = 1.6 V
Vref = 1.6, RL = 3.9 kΩ
Vref = 0.9, RL = 3.9 kΩ
Input
Pin
Ref
Ref
–
Ref
Ref
Measure
Pin
Symbol
Min
Ref/ Threshold
–
BD Out
Ref/
Hys
–
BD Out
Ref
BD Out
BD Out
Iin
VOH
VOL
–
VCC – 0.1
–
Typ
1.23
2.0
12.33
2.59
0.6
Max
Unit
–
V
–
mV
50
nA
–
V
0.4
V
Data
Signal
Data Amp
Output
Figure 3. Data Amp Operation
Data Amp
Hysteresis
MOTOROLA RF/IF DEVICE DATA
11