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HCS370ST Datasheet(PDF) 5 Page - Microchip Technology |
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HCS370ST Datasheet(HTML) 5 Page - Microchip Technology |
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5 / 36 page  2002 Microchip Technology Inc. Preliminary DS41111D-page 5 HCS370 2.0 DEVICE DESCRIPTION As shown in the typical application circuits (Figure 2-1), the HCS370 is an easy device to use. It requires only the addition of buttons and RF circuitry for use as the encoder in your security application. A description of each pin is described in Table 2-1. Refer to Figure 2-3 for information on the I/O pins. TABLE 2-1: PIN DESCRIPTIONS The HCS370 will normally be in a low power SLEEP mode. When a button input is taken high, the device will wake-up, start the step-up regulator, and go through the button debounce delay of TDB before the button code is latched. In addition, the device will then read the configuration options. Depending on the configura- tion options and the button code, the device will deter- mine what the data and modulation format will be for the transmission. The transmission will consist of a stream of code words and will be transmitted TPU after the button is pressed for as long as the buttons are held down or until a time-out occurs. The code word format can be either a code hopping format or a seed format. The time-out time can be selected with the Time-out Select (TSEL) configuration option. This option allows the time-out to be set to 0.8s, 3.2s, 12.8s, or 25.6s. When a time-out occurs, the device will go into SLEEP mode to protect the battery from draining when a button gets stuck. This option must be chosen to meet maxi- mum transmission length regulatory limits which vary by country. FIGURE 2-1: TYPICAL CIRCUITS Note: S0-S5 and SHIFT inputs have pull-down resistors. VIN should be tied high if the step-up regulator is not used. Name Pin Number Description S0 1 Switch input S0 S1 2 Switch input S1 S2 3 Switch input S2 S3 4 Switch input S3 S4 5 Switch input S4 S5/SLEEP 6 Switch input S5, or SLEEP output SHIFT 7 SHIFT input VIN 8 Step-up regulator input STEP 9 Step-up pulses output RFEN 10 RF enable output VSS 11 Ground reference DATA 12 Transmission output pin LED 13 Open drain output for LED with pull-up resistor VDD 14 Positive supply voltage S2 VDD B0 Tx out S2 Six Button remote with PLL control B1 S0 S1 S3 LED VDD DATA VSS S4 S5 SHIFT RFEN STEP VIN DATA SHIFT Figure 2-1(A) B2 B3 B4 B5 RLED RF PLL DATA IN ENABLE VDD S2 2.05-5.5V Tx out S2 Two Button remote with Step-up circuit S0 S1 S3 LED VDD DATA VSS S4 SLEEP SHIFT RFEN STEP VIN DATA SHIFT 33k Ω 10k Ω Figure 2-1(B) 2.2 k Ω 330 µH 1N4148 COUT 2N3904 6V@1 mA Note: Using SLEEP output low instead of grounding the resistor divider reduces battery drain between transmissions VDD Tx out Tx1 Tx2 DUAL Transmitter remote control S2 S0 S1 S3 LED VDD DATA VSS S4 S5 SHIFT RFEN STEP VIN DATA SHIFT Figure 2-1(C) RLED VDD 22 µF 1000 pF |
Similar Part No. - HCS370ST |
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Similar Description - HCS370ST |
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