NM95HS01 NSC [National Semiconductor], NM95HS01 Datasheet - Page 4

• Manufacturer Part Number: NM95HS01
• Description: HiSeC-TM High Security Rolling Code Generator
• Manufacturer: NSC [National Semiconductor]

http
Figure 3 shows several typical circuit configurations for a
ceiver using an 8-Bit Microcontroller
General Transmitter Circuit
Configurations
HiSeC based RKE system transmitter Note that all circuits
require few external components beyond a battery and
transmitter stage IR and RF bit timing may be optimized
through the timer block settings in the EEPR0M array which
allows flexibility in selecting the smallest and least expen-
sive clock components in the chosen design range
The first two circuits are examples of RF transmitter applica-
tions with both RC and crystal (XTAL) oscillator clocks the
third circuit is an example of an IR transmitter application
Two circuits are configured for an LED Note that the LED
pin refers to a visual indicator LED and not the IR LED
which might be used in an IR transmitter circuit
The LEDSEL bit in the EEPROM array determines whether
the RFEN LED or CKO LED pins are dedicated to the LED
for a particular circuit configuration LED pin select options
are detailed in Table I
Design considerations for selecting and optimizing clock
component values are detailed in the Generator Clock De-
sign Parameters section
General Receiver Circuit
Configurations
The NM95HS01 02 HiSeC Generator with the standard
customer algorithm is matched to a companion part the
MM57HS HiSeC Decoder For applications requiring more
extensive receiver design and decoder programming a
COPS8xxx NM93Cx6 package is recommended A com-
plete discussion of receiver oonfigurations and considera-
tions can be found in the National Semiconductor Applica-
tion Note How to Design and Program a HiSeC RKE Re-
www national com
Either the LED or RFEN outputs of the NM95HS01 02 can be used to indicate device transmis-
sion The LED output is active during a pause whereas the RFEN output is active during frame
transmission
The IR Drive Current is 10 mA so an amplifier stage may be needed
Clock
XTAL
XTAL
RC
LEDSEL
X
0
1
TABLE I LED Pin Select Options
RFEN LED
RFEN
RFEN
LED
4
CKO LED
FIGURE 3 Typical Transmitter Circuit Configurations
CKO
CKO
LED
RF Mode with LED
RF Mode w o LED
IR mode with LED
Function
TL D 12302 – 3