hcs370 Microchip Technology Inc., hcs370 Datasheet - Page 10

• Manufacturer Part Number: hcs370
• Description: Keeloq Code Hopping Encoder
• Manufacturer: Microchip Technology Inc.

HCS370
3.1
The HCS370 contains two transmitter configurations
with separate serial numbers, encoder keys, discrimi-
nation values, syncronization counters, and seed val-
ues. The code word is calculated using one of two
possible encoder configurations. Most options for code
word and modulation formats can be different from
Encoder 1 and Encoder 2. However, LED and RF
transmitter options have to be the same. The SHIFT
input pin is used to select between the encoder config-
urations. A low on the SHIFT pin will select Encoder 1
and a high will select Encoder 2.
DS41111D-page 10
WAKE
CNTSEL
VLOWL
VLOWSEL
PLLSEL
MTX
SOEN
WAIT
TSEL
Note 1: All Timing values vary ±10%.
Symbol
2: Voltage thresholds are ±150 mV.
Dual Encoder Operation
Address
3D: ---- --10
3D: --54 ----
3F: ---- --10
3D: ---- 3---
3D: ---- -2--
3F: ---- -2--
3F: ---- 3---
3F: ---4 ----
3F: --5- ----
16
:Bits
Wake-up
Counter Select
Low Voltage Latch Enable
Low Voltage Trip Point Select
PLL Interface Select
Minimum Code Words
SLEEP Output Enable
Wait for Step-Up Regulator
Time-out Select
(1)
(1)
Preliminary
Description
(2)
Disable = 0
Disable = 0
Disable = 0
16 bits = 0
2.2 V = 0
ASK = 0
Value
Value
Value
(1)
00
01
10
00
01
10
00
01
10
11
11
11
2
2
2
100 ms 16.7%
50 ms 33.3%
No Wake-up
75 ms 50%
Enable = 1
Enable = 1
Enable = 1
20 bits = 1
3.2V = 1
FSK = 1
Time(s)
Value
Value
2002 Microchip Technology Inc.
12.8
25.6
0.8
3.2
1
2
4
8
4.1
3.2.1
3.2.3.1
3.2.3.1
5.2
2.0
5.4
5.2, 5.4
2.0
Reference
Section