HCS360-/P MICROCHIP [Microchip Technology], HCS360-/P Datasheet - Page 14

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HCS360-/P

Manufacturer Part Number
HCS360-/P
Description
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
HCS360
5.5
The Auto-shutoff function automatically stops the
device from transmitting if a button inadvertently gets
pressed for a long period of time. This will prevent the
device from draining the battery if a button gets
pressed while the transmitter is in a pocket or purse.
This function can be enabled or disabled and is
selected by setting or clearing the time-out bit
(Section 3.5.5). Setting this bit will enable the function
(turn Auto-shutoff function on) and clearing the bit will
disable the function. Time-out period is approximately
25 seconds.
5.6
The V
(Figure 4-3) and will be transmitted as a one if the
operating voltage has dropped below the low voltage
trip point, typically 3.8V at 25°C. This V
transmitted so the receiver can give an indication to the
user that the transmitter battery is low.
5.7
During normal transmission the LED output is LOW
while the data is being transmitted and high during the
guard time. Two voltage indications are combined into
one bit: V
of V
FIGURE 5-2:
DS40152D-page 14
(1 out of 2 transmitted)
(All words transmitted)
LOW
LOW
BACW Disabled
BACW Enabled
while data is being transmitted.
Auto-shutoff
V
LOW
LED Output Operation
LOW
bit is transmitted with every transmission
. Table 5-1 indicates the operation value
: Voltage LOW Indicator
BLANK ALTERNATE CODE WORD
Amplitude
2A
A
Min Tx Length
LOW
100ms
signal is
100ms
FIGURE 5-1:
If the supply voltage drops below the low voltage trip
point, the LED output will be toggled at approximately
1Hz during the transmission.
TABLE 5-1
*See also Flash operating modes.
4.5
3.5
2.5
1.5
Supply Voltage
4
3
2
Approximate
3.8V → 2.2V
-40
Max → 3.8V
2.2V → Min
Time
One Code Word
V
V
V
100ms
LOW
LOW
LOW
V
TEMPERATURE
V
=0
=1
=0
LOW
LOW
Vlow Bit
 2001 Microchip Technology Inc.
TRIP POINT VS.
AND LED VS. V
25
0
1
0
Nominal Trip Point
Nominal Trip
100ms
3.8V
Point
LED Operation*
Flashing
Normal
Normal
DD
85
3.5
2V

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