hcs362 Microchip Technology Inc., hcs362 Datasheet - Page 6

• Manufacturer Part Number: hcs362
• Description: Keeloq Code Hopping Encoder
• Manufacturer: Microchip Technology Inc.

HCS362
FIGURE 2-2:
DS40189D-page 6
S3 Input/
RFEN Output
DATA I/O
SHIFT input
LED output
S0, S1, S2
Inputs
ESD
ESD
ESD
I/O CIRCUITS
NFET
ESD
PFET
NFET
PFET
V
V
RS
RL
DD
DD
LEDL
RDATA
RS
NFET
DATA
RFEN
RH
SHIFT
LEDH
Preliminary
2.1
2.1.1
The HCS362 has an onboard non-volatile EEPROM,
which is used to store user programmable data. The
data can be programmed at the time of production and
include the security-related information such as
encoder keys, serial numbers, discrimination and seed
values. All the security related options are read
protected. The HCS362 has built in protection against
counter corruption. Before every EEPROM write, the
internal circuitry also ensures that the high voltage
required to write to the EEPROM is at an acceptable
level.
2.1.2
The HCS362 has an onboard RC oscillator that con-
trols all the logic output timing characteristics. The
oscillator frequency varies within ±10% of the nominal
value (once calibrated over a voltage range of 2V –
3.5V or 3.5V – 6.3V). All the timing values specified in
this document are subject to the oscillator variation.
FIGURE 2-3:
2.1.3
A low battery voltage detector onboard the HCS362
can indicate when the operating voltage drops below a
predetermined value. There are eight options available
depending on the
The options provided are:
000
001
010
011
1.10
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
-50-40 -30-20-10 0 10 20 30 40 50 6070 80 90
Note:
- 2.0V
- 2.1V
- 2.2V
- 2.3V
T
E
Architectural Overview
ONBOARD EEPROM
INTERNAL RC OSCILLATOR
LOW VOLTAGE DETECTOR
Values are for calibrated oscillator
HCS362 NORMALIZED T
TEMPERATURE
Temperature °C
VLOW
[
0..2
2002 Microchip Technology Inc.
100
101
110
111
T
T
E
E
] configuration options.
- 4.0V
- 4.2V
- 4.4V
- 4.6V
V
DD
= 2.0V
= 3.0V
= 6.0V
Legend
E
Typical
VS.