
16-3
ML63326 User's Manual
Chapter 16 Battery Low Detect Circuit (BLD)
16
16.5 Battery Low Detect Circuit Operation
The battery low detect circuit is turned ON or OFF by ENBL (bit 2 of BLDCON), and outputs
to BLDF (bit 3 of BLDCON) the result of a comparison with the judgment voltage.
ENBL is the enable control bit for the battery low detect circuit. Setting ENBL to "1" turns ON
the battery low detect circuit. Setting ENBL to "0" turns OFF the battery low detect circuit and
BLD current supply drops to zero.
BLDF is the judgment result flag. If BLDF is "1", the power supply voltage is lower than the
judgment voltage. If BLDF is "0", the power supply voltage is higher than the judgment
voltage. BLDF is valid when ENBL is "1".
The judgment circuit of the battery low detect circuit requires time to become stable.
Therefore, after setting ENBL to "1", wait at least 1 ms before reading BLDF. No load should
be applied to the power supply voltage during the detection.
Figure 16-2 shows an example operation timing.
Judgment voltage
Vcmp
BLDF
V
SS
"1" or "0"
Vcmp
ENBL
q
w
r
e
Operation
BLD stabilization time
(wait at least 1 ms)
Set ENBL
Read BLDF
Reset ENBL
Figure 16-2 Operation Timing Example
Figure 16-2 shows the following operations.
q
ENBL is set to "1" to turn ON the BLD.
w
Operation starts with no load applied to power supply system and waits for BLD
stabilization time interval (at least 1 ms).
e
Judgment result flag (BLDF) is read.
r
ENBL is cleared to "0".
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