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HCS410-IST Datasheet(PDF) 6 Page - Microchip Technology |
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HCS410-IST Datasheet(HTML) 6 Page - Microchip Technology |
6 / 36 page HCS410 DS40158E-page 6 Preliminary 2001 Microchip Technology Inc. 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 60k¾ (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. The input impedance of the LC pins is a function of input voltage. At low voltages, the input impedance is in the order of mega-ohms. When laying out a PC board, care should be taken to ensure that there is no cross coupling between the LC pins and other traces on the board. Glitches on the LC lines will cause the device to reset. A high-value resistor (220 K Ω) between LC0 and GND can be added to reduce sensitivity. 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 1 00 01 Normal Code Hopping transmission 2 00 10 Normal Code Hopping transmission 3 00 11 Delayed seed transmission if allowed by SEED and TMPSD/Normal Code Hopping transmission 4 01 00 Normal Code Hopping transmission 5 01 01 Normal Code Hopping transmission 6 01 10 Normal Code Hopping transmission 7 01 11 Immediate seed transmission if allowed by SEED and TMPSD/Normal Code Hopping transmission 8 10 00 Transponder mode |
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