MS51
Nov. 28, 2019
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214
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Rev 1.00
MS51
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functionality with limited detection response. By setting LPBOD[1:0] (BODCON1[2:1]), the BOD circuit
can be periodically enabled to sense the power voltage nominally every 1.6 ms, 6.4 ms, or 25.6 ms. It
saves much power but also provides low-speed power voltage sensing. Note that the hysteresis
feature will disappear in low power BOD mode.
For a noise sensitive system, the MS51 has a BOD filter which filters the power noise to avoid BOD
event triggering unconsciously. The BOD filter is enabled by default and can be disabled by setting
BODFLT (BODCON1.0) as 0 if user requires a rapid BOD response. The minimum brown-out detect
pulse width is listed in LPBOD[1:0] (BODCON1)
BOV[1:0]
Brownout Detection
V
DD
+
-
V
BOD
Voltage
Select
BODEN
BOS
BORST
Brown-out Reset
BOF
Brown-out Interrupt
or
BORF
LPBOD[1:0]
BOD
Filter
BODFLT
Figure 6.2-2 Brown-out Detection Block Diagram