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HCS473ISLSQTP Datasheet(PDF) 7 Page - Microchip Technology |
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HCS473ISLSQTP Datasheet(HTML) 7 Page - Microchip Technology |
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7 / 68 page  2002 Microchip Technology Inc. Preliminary DS40035C-page 5 HCS473 2.0 DEVICE DESCRIPTION The HCS473 is designed for small package outline, cost-sensitive applications by minimizing the number of external components required for RKE and PKE appli- cations. Figure 2-1 shows a typical 3-axis HCS473 RKE/PKE application. • The switch inputs have internal pull-down resis- tors and integrated debouncing allowing a switch to be directly connected to the inputs. The transponder circuitry requires only the addition of external LC-resonant circuits for inductive communica- tion capability. • The open-drain LED output allows an external resistor for customization of LED brightness - and current consumption. • The DATA output can be directly connected to the RF circuit or connected in conjunction with S3/ RFEN to a PLL. 2.1 Pinout Overview A description of pinouts for the HCS473 can be found in Table 2-1. TABLE 2-1: PINOUT SUMMARY 2.2 LF Antenna Considerations A typical magnetic low frequency sensor (receiving antenna) consists of a parallel inductor-capacitor circuit that is sensitive to an externally applied magnetic sig- nal. This LC circuit is tuned to resonate at the source signal's base frequency. The real-time voltage across the sensor represents the presence and strength of the surrounding magnetic field. By amplitude modulating the source's magnetic field, it is possible to transfer data over short distances. This communication approach is successfully used with distances up to 1.8 meters, depending on transmission strengths and sen- sor sensitivity. Two key factors that greatly affect com- munication range are: 1. Sensor tuning 2. A properly tuned sensor's relative sensitivity An LC antenna’s component values may be initially cal- culated using the following equation. “Initially” because there are many factors affecting component selection. It is not this data sheet’s purpose to present in-depth details regarding LC antenna and their tuning. Please refer to “Low Frequency Magnetic Transmitter Design Application Note”, AN232, for appropriate LF antenna design details. Pin Name Pin Number Description S0 1 Button input pin with Schmitt Trigger detector and internal pull-down resistor (Figure 2-3). S1 2 Button input pin with Schmitt Trigger detector and internal pull-down resistor (Figure 2-3). S2 3 Button input pin with Schmitt Trigger detector and internal pull-down resistor (Figure 2-3). S3/RFEN 4 Multi-purpose input/output pin (Figure 2-4). • Button input pin with Schmitt Trigger detector and internal pull-down resistor. • RFEN output driver. V DDT 5 Transponder supply voltage. Regulated voltage output for strong inductive field. LCX 6 Sensitive transponder input X (Figure 2-7). A strong signal on this pin is internally regulated and supplied on V DD for low-battery operation/recharging. LCY 7 Sensitive transponder input Y (Figure 2-7) LCZ 8 Sensitive transponder input Z (Figure 2-7) LCCOM 9 Transponder bias output (Figure 2-7) V SST 10 Transponder ground reference, must be connected to V SS. V SS 11 Ground reference DATA 12 Transmission data output (Figure 2-5) LED 13 Open drain LED output (Figure 2-6) V DD 14 Positive supply voltage Note: Microchip also has a confidential Applica- tion Note on Magnetic Sensors (AN832C). Contact Microchip for a Non-Disclosure Agreement in order to obtain this applica- tion note. 2πF 1 LC ----------- = |
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