HCS365 Datasheet, PDF (10/34 Pages) Microchip Technology – KEELOQ Code Hopping Encoder

HCS365
TABLE 3-3: DEVICE OPTIONS
Symbol Address₁₆:Bits
Description⁽¹⁾
WAKE
3F: ---- --10 Wake-up⁽¹⁾
CNTSEL
VLOWL
VLOWSEL
PLLSEL
MTX
3F: ---- -2--
3F: ---- 3---
3F: ---4 ----
3F: --5- ----
3D: ---- --10
Counter Select
Low Voltage Latch Enable
Low Voltage Trip Point Select⁽²⁾
PLL Interface Select
Minimum Code Words
TSEL
3D: --54 ---- Time-out Select⁽¹⁾
DUAL
3D:-----2-- Dual Encoder Enable
RFENO
3D: ----3--- RF Enable Output Select
Note 1: All Timing values vary ±10%.
2: Voltage thresholds are ±150 mV.
Value₂
00
01
10
11
16 bits = 0
Disable = 0
2.2 V = 0
ASK = 0
Value₂
00
01
10
11
Value₂
00
01
10
11
Disable = 0
Disable = 0
3.1 Dual Encoder Operation
The HCS365 contains two transmitter configurations
with separate serial numbers, encoder keys, discrimi-
nation values, counters, and seed values. This means
that the HCS365 can be used as two independent
encoders. 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.
Value
No Wake-up
75 ms 50%
50 ms 33.3%
100 ms 16.7%
20 bits = 1
Enable = 1
3.2V = 1
FSK = 1
Value
1
2
4
8
Time(s)
0.8
3.2
12.8
25.6
Enable = 1
Enable = 1
Reference
Section
4.1
3.2.1
3.2.3.1
3.2.3.1
5.2
2.0
2.0
DS41109D-page 10
Preliminary
© 2002 Microchip Technology Inc.