HCS101 PDF даташит
Спецификация HCS101 изготовлена «Microchip» и имеет функцию, называемую «Fixed Code Encoder». |
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Детали детали
Номер произв | HCS101 |
Описание | Fixed Code Encoder |
Производители | Microchip |
логотип |
20 Pages
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HCS101
Fixed Code Encoder
FEATURES
Operating
• 2 Programmable 32-bit serial numbers
• 10-bit serial number
• 66-bit transmission code length
• Non-volatile 16-bit counter
• 3.5V -13.3V operation
• 3 inputs, 7 functions available
• Selectable baud rate
• Automatic code word completion
• Battery low signal transmitted to receiver
Other
• Pin-out compatible with most KEELOQ® Encoders
• Simple programming interface
• On-chip EEPROM
• On-chip oscillator and timing components
• Button inputs have internal pull-down resistors
• Minimum External Components required
Typical Applications
The HCS101 is ideal for remote control applications.
These applications include:
• Low-end automotive alarm systems
• Low-end automotive immobilizers
• Gate and garage door openers
• Identity tokens
• Low-end burglar alarm systems
• Fan and lighting controls
• Toys
DESCRIPTION
The HCS101 from Microchip Technology Inc. is a fixed
code encoder designed for remote control systems. It
provides a small package outline and low cost to make
this device a perfect solution for unidirectional remote
control systems.
It is also pin compatible with Microchip’s HCS201 Code
Hopping Encoder allowing easy upgrading to a more
secure remote keyless entry (RKE) system.
The 8-pin HCS101 operates over a wide voltage range
of 3.5V to 13.3V and has three button inputs allowing
the system designer the freedom to utilize up to 7 func-
tions. The only components required for device opera-
tion are the buttons and RF circuitry, allowing a very low
system cost.
PACKAGE TYPES
PDIP, SOIC
S0 1
8 VDD
S1 2
7 NC
S2 3
NC 4
6 DATA
5 VSS
HCS101 BLOCK DIAGRAM
Oscillator
RESET Circuit
Controller
Power
latching
and
switching
DATA
VSS
VDD
EEPROM
Transmit register
Button input port
S2 S1 S0
1999-2013 Microchip Technology Inc.
Preliminary
DS41115D-page 1
No Preview Available ! |
HCS101
1.0 SYSTEM OVERVIEW
As indicated in the block diagram in Figure 1-1, the
HCS101 has a small EEPROM array, which must be
loaded with several parameters before use. These
parameters include:
• Two 32-bit serial numbers
• 16-bit counter value
• Additional 10-bit serial number
• Configuration data
The EEPROM data for each transmitter is programmed
by the manufacturer at the time of production.
Any type of controller may be used as a receiver, but it
is typically a microcontroller with compatible firmware
that allows the receiver to operate in conjunction with a
transmitter, based on the HCS101.
FIGURE 1-1:
BASIC OPERATION OF TRANSMITTER ENCODER
Transmitted Information
EEPROM Array
Serial Number 3
Counter
Serial Number 1
Serial Function
Number 3 Bits
Counter
Serial Number 1
Function
Bits
DS41115D-page 2
Preliminary
1999-2013 Microchip Technology Inc.
No Preview Available ! |
HCS101
2.0 DEVICE OPERATION
As shown in the typical application circuits in Figure 2-
1, the HCS101 is easy to use. It requires only the addi-
tion of buttons and RF circuitry for use as the transmit-
ter in your application. A description of each pin is given
in Table 2-1.
FIGURE 2-1:
VDD
TYPICAL CIRCUITS
B0 S0 VDD
B1 S1 NC
S2 DATA
Tx out
NC VSS
2 button remote control
B3 B2 B1 B0
VDD
S0 VDD
S1 NC
S2 DATA
NC VSS
Tx out
Note:
4 button remote control
Up to 7 functions can be implemented
by pressing more than one button
simultaneously or by using a suitable
diode array.
TABLE 2-1: PIN DESCRIPTIONS
Name
Pin
Number
Description
S0 1
Switch input 0
S1 2
Switch input 1
S2 3
Switch input 2/Clock pin for
Programming mode
NC 4
No connection
VSS 5
Ground reference connection
DATA 6
Pulse Width Modulation (PWM)
output pin/Data pin for
Programming mode
NC 7
No connection
VDD 8 Positive supply voltage connection
The HCS101 will wake-up upon detecting a switch clo-
sure and then delay for a debounce delay (TDB) as
shown in Figure 2-2. The device will then update the
16-bit counter before it loads the transmit register. The
data is then transmitted serially on the DATA pin in
Pulse Width Modulation (PWM) format.
If additional buttons are pressed during a transmission,
the current transmission is terminated. The HCS101
restarts and the new transmission will contain the latest
button information. When all buttons are released, the
device completes the current code word and then pow-
ers down. Released buttons do not terminate and/or
restart transmissions.
FIGURE 2-2:
ENCODER OPERATION
Power-Up
(A button has been pressed)
RESET and Debounce Delay
Sample Inputs
Update Counter
Load Transmit Register
Transmit
Yes Buttons
Added
?
No
All
Buttons
Released
?
No
Yes
Complete Code
Word Transmission
Stop
1999-2013 Microchip Technology Inc.
Preliminary
DS41115D-page 3
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