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14. Battery Low Detect Circuit (BLD)
14.1
Overview
The OPTION C and OPTION D have an internal battery low detect circuit (BLD).
The battery low detect circuit detects when the battery voltage (supply voltage V
voltage value. Four levels of judgment voltage can be selected by the BLDCON bits.
Judgment voltage values (Ta = 25°C): 1.8 ±0.1 V, 2.0 ±0.1 V, 2.4 ±0.1 V, 2.6 ±0.1 V
!
Note:
•
Does not apply to the OPTION A and OPTION B.
•
When verifying BLD operation, the operation must be verified with an evaluation sample device.
14.2
Battery Low Detect Circuit Configuration
The battery low detect circuit consists of a judgment circuit and a judgment voltage select circuit. Figure 14-1
shows the circuit configuration.
V
DD
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
Judgment circuit
BLDF
ENBL
Judgment voltage
select circuit
Figure 14-1 Battery Low Detect Circuit
14 – 1
Chapter 14 Battery Low Detect Circuit (BLD)
DD
Data bus
Read BLDCON
BLDCON
3
Q I/O
OPTION B (D): 1.5 V (3.0 V), With regulator
ML63611 User's Manual
) falls below the judgment
4
circuit for LCD bias
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