Brownout Detector; Figure 23-2. Bias-And-Control Network Block Diagram - Sharp Blue Treak LH75400 User Manual

Analog-to-Digital Converter/Brownout Detector

23.1.3 Brownout Detector

The Brownout Detector is an asynchronous comparator that compares a divided version
of the 3.3 V supply and a bandgap-derived reference voltage. If the supply dips below a
Trip point, the Brownout Detector sets a bit in the IS Register. The status bit is wired to the
VIC and can interrupt the processor core. This allows the Host Controller to warn users of
an impending shutdown and may provide the ADC with time to save its state. For Brownout
Detector trip point and hysteresis levels, see Chapter 24.
NOTE: The Brownout Detector indicates a brownout condition on startup until the VDDA pin rises
23-4
AVDD
AVDD
AVDD
AVDD
100K
PENIRQ

Figure 23-2. Bias-and-Control Network Block Diagram

above the trip point.
LH75400/01/10/11 (Preliminary) User's Guide
AVDD
100K
PENIRQ
B2 B12
B3
B4
B5
B6
B7
B13
B8
6/25/03
11-TO-1
ANALOG A/D IN+
MUX
LH754xx-28