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HCS410 Datasheet(PDF) 7 Page - Microchip Technology |
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HCS410 Datasheet(HTML) 7 Page - Microchip Technology |
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7 / 36 page  HCS410 © 1997 Microchip Technology Inc. Preliminary DS40158C-page 7 2.1 Pinout Description The HCS410 has the same footprint as all of the other devices in the KEELOQ family, except for the two pins that are reserved for transponder operations and the LED that is now located at the same position as the S2 switch input. • S[0:1] – are inputs with Schmitt Trigger detectors and an internal 60k Ω (nominal) pull-down resistors. • S2/LED – uses the same input detection circuit as S0/S1 but with an added PMOS transistor con- nected to VDD capable of sourcing enough current to drive an LED. • LC[0:1] – is the transponder interface pins to be connected to an LC circuit for inductive communi- cation. LC0 is connected to a detector for data input. Data output is achieved by clamping LC0 and LC1 to GND through two NMOS transistors. These pins are also connected to a rectifier and a regulator, providing power to the rest of the logic and for charging an external power source (Bat- tery/Capacitor) through VDD. TABLE 2-1: PINOUT DESCRIPTION Name Pin Number Description S0 1 Switch input 0 S1 2 Switch input 1 S2/LED 3 Switch input 2/LED output, Clock pin for programming mode LC1 4 Transponder interface pin VSS 5 Ground reference connection PWM 6 Pulse width modulation (PWM) output pin/Data pin for programming mode LC0 7 Transponder interface pin. VDD 8 Positive supply voltage connection TABLE 2-2: FUNCTION CODES LC0 S2 S1 S0 Comments 10001 Normal Code Hopping transmission 20010 Normal Code Hopping transmission 30011 Delayed seed transmission if allowed by SEED and TMPSD/Normal Code Hopping transmission 40100 Normal Code Hopping transmission 50101 Normal Code Hopping transmission 60110 Normal Code Hopping transmission 70111 Immediate seed transmission if allowed by SEED and TMPSD/Normal Code Hopping transmission 81000 Transponder mode |
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