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SI9241AEY Datasheet(PDF) 4 Page - Vishay Siliconix |
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SI9241AEY Datasheet(HTML) 4 Page - Vishay Siliconix |
4 / 5 page 1 2 3 4 5 6 7 8 Top View Narrow Body TX VDD FAULT VBAT K GND SO Package CS RX Si9241AEY Vishay Siliconix www.vishay.com 4 Document Number: 70787 S-02936—Rev. D, 22-Jan-01 PIN CONFIGURATION ORDERING INFORMATION Part Number Temperature Range Si9241AEY –40 to 125 _C PIN DESCRIPTION Pin Number Symbol Description 1 VDD Positive Power Supply 2 TX Transmit, Input 3 CS Chip Select, Input 4 FAULT Fault, Open Drain Output 5 GND Ground Connection 6 K Transmit/Receive, Bidirectional 7 VBAT Battery Power Supply 8 RX Receiver, Output FUNCTIONAL DESCRIPTION The Si9241AEY can be either in transmit or receive mode and it contains over temperature, and short circuit VBAT fault detection circuits. The voltage on K is internally compared to VBAT/2. If the voltage on the K pin is less than VBAT/2 then RX output will be “low.” If the voltage on the K pin is greater than VBAT/2 then RX output will be “high.” In order to be in transmit mode, CS must be set “low.” When CS and TX are set “low” the internal MOSFET will turn on, causing the K pin to be “low.” In the transmit mode, the processor monitors RX and TX. When the two mirror each other there is no fault. In the event of over temperature, or short circuit to VBAT, the Si9241AEY will turn off the K output to protect the IC and the external open drain FAULT pin will be asserted. The K pin will stay in high impedance and RX will follow the K pin. The fault will be reset when CS is toggled high. RX, CS and TX pins have an internal pull up resistor to VDD while the K pin has internal pull down resistors. When any one of the TX, VBAT or GND pins is open the K output is off. When CS is set “high” the Si9241AEY is in receive mode and the internal MOSFET for the K pin is turned off. The RX output will follow the K pin. If CS is “low” while the IC is receiving data, an incorrect fault signal will occur. To inhibit the short detect, tie CS and TX together. |
Similar Part No. - SI9241AEY_01 |
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Similar Description - SI9241AEY_01 |
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