HCS300-IP Microchip Technology, HCS300-IP Datasheet - Page 10

• Manufacturer Part Number: HCS300-IP
• Description: KEE LOQ Code Hopping Encoder
• Manufacturer: Microchip Technology

HCS300
FIGURE 5-1:
5.6
The VLOW bit is transmitted with every transmission
(Figure 8-4) and will be transmitted as a one if the
operating voltage has dropped below the low voltage
trip point. The trip point is selectable between two
values, based on the battery voltage being used. See
Section 3.6.5 for a description of how the low voltage
select option is set. This VLOW signal is transmitted so
the receiver can give an audible signal to the user that
the transmitter battery is low (Section 5.8).
5.7
This bit will be low for the first transmitted word. If a
button is held down for more than one transmitted code
word, this bit will be set to indicate a repeated code
word and remain set until the button is released
(Figure 8-4).
5.8
During normal transmission the LED output is LOW. If
the supply voltage drops below the low voltage trip
point, the LED output will be toggled at approximately
5Hz during the transmission (Section 3.6.5).
DS21137D-page 10
(1 out of 4 transmitted)
(1 out of 2 transmitted)
(All words transmitted)
BACW Enabled
BACW Disabled
BACW Enabled
VLOW: Voltage LOW Indicator
RPT: Repeat Indicator
LED Output Operation
BLANK ALTERNATE CODE WORD (BACW)
2A
4A
Amplitude
A
100ms
Preliminary
100ms
Time
One Code Word
100ms
1996 Microchip Technology Inc.
100ms