RFHCS362G_11 Datasheet, PDF (11/54 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder with UHF ASK/FSK Transmitter

2.1.3 LOW VOLTAGE DETECTOR
A low battery voltage detector onboard the rfHCS362G/
362F can indicate when the operating voltage drops
below a predetermined value. There are eight options
available depending on the VLOW[0..2] configuration
options. The options provided are:
000 - 2.0V
001 - 2.1V
010 - 2.2V
011 - 2.3V
100 - 4.0V
101 - 4.2V
110 - 4.4V
111 - 4.6V
FIGURE 2-4: rfHCS362 VLOW DETECTOR
(TYPICAL)
2.7
2.5
2.3
2.1
1.9
1.7
1.5
-40 -25 -10 5 20 35 50 65 80
Temperature (°C)
VLOW Option
◆ = 000
■ = 001
▲ = 010
✖ = 011
rfHCS362G/362F
FIGURE 2-5: rfHCS362 VLOW DETECTOR
(TYPICAL)
5.5
5.3
5.1
4.9
4.7
4.5
4.3
4.1
3.9
3.7
3.5
-40 -25 -10 5
20 35 50 65 80
Temperature (°C)
VLOW Option
◆ = 100
■ = 101
▲ = 110
✖ = 111
The output of the low voltage detector is transmitted in
each code word, so the decoder can give an indication
to the user that the transmitter battery is low. Operation
of the LED changes as well to further indicate that the
battery is low and needs replacing.
© 2011 Microchip Technology Inc.
DS41189B-page 11