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TPIC84000TPWPRQ1 데이터시트(PDF) 5 Page - Texas Instruments |
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TPIC84000TPWPRQ1 데이터시트(HTML) 5 Page - Texas Instruments |
5 / 29 page TPIC84125-Q1 www.ti.com SLDS175 – AUGUST 2010 DEVICE INFORMATION The TPIC84125 is designed to control Passive Entry, Passive Start (PEPS) systems as a part of the central body control module. Functionally, the TPIC84125 transmits a magnetic field signal via antenna coils located throughout the vehicle. The data is transmitted using amplitude shift keying (ASK). Such a signal is received by an external RFID card or key, which then activates the card or key to then process and send an authenticating signal back to the vehicle, thus authenticating the driver. Once authenticated, the driver is able to open doors or start the vehicle depending on the systems specific configuration. In general, the antenna load of the TPIC84125 is a coil, which generates a magnetic field which is high enough to transmit data to the ID card, and accurate enough for location recognition outside of the vehicle. Functional Description Power Management The TPIC84125 operates with three types of supply voltage: Digital 5V (VD), Analog 5V (VA ), and Power (VS). While VD is used for the internal digital circuitry and VA voltage determines: • The accuracy of the output voltage in data and destroy modes, because the sine wave signal is derived from the VA voltage. • The accuracy of the current measurements, because the Current Measurement (ADC) reference voltage is derived from the VA voltage. • The supply currents for the IC, as the bias current is derived from the VA voltage. NOTE VD and VA must be tied together to avoid latch up. VS must be powered on all VS pins regardless of which outputs are used. Biasing: Biasing of the circuit is done by an external resistor, RBIAS = 62kΩ, 1%, 50ppm. The value of the RBIAS resistance determines: • The accuracy of the current measurements, because the ADC reference voltage is proportional to the VA voltage divided by the value of RBIAS. • The supply currents for the IC, as the biasing current is proportional to the VA voltage divided by the value of RBIAS. Clock Divider The Clock Divider generates a 2 MHz internal clock signal from the external clock. The internal clock frequency is used for: • Clearing and latching the fault bits within Control and Status Register (CSR). • For generating the frequency of the sine wave The divider can be programmed to either: /1, /2, /4, /8, with the default being /8. Table 1 shows the possible CLK_IN input frequencies to generate 125 kHz signal. Table 1. Clock Divider Divider CLK_IN /1 2 MHz /2 4 MHz /4 8 MHz /8 (default) 16 MHz Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): TPIC84125-Q1 |
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