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MICRF104 Datasheet(PDF) 2 Page - Micrel Semiconductor |
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MICRF104 Datasheet(HTML) 2 Page - Micrel Semiconductor |
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MICRF104 Micrel MICRF104 2 November 8, 2001 Pin Description Pin Number Pin Name Pin Function 1 VDDPWR Positive power supply input for the DC/DC converter. 2, 4, 13 VSS Ground return 3 5V 5V Output from the DC / DC converter 5 REFOSC This is the timing reference frequency which is the transmit frequency divided by 32. Connect a crystal (mode dependent) between this pin and VSS, or drive the input with an AC coupled 0.5Vpp input clock. See Refer- ence Oscillator Section in this data sheet 6 RFSTBY Input for transmitter standby control pin is pulled to VDDRF for transmit operation and VSS for stand-by mode. 7 ANTM Negative RF power output to drive the low side of the transmit loop antenna 8 ANTP Positive RF power output to drive the high side of the transmit loop antenna 9 ASK Amplitude Shift Key modulation data input pin. 10 VDDRF Positive power supply input for the RF circuit. A power supply bypass capacitor connected from VDDRF to VSS should have the shortest possible path. 11 PC Power Control Input. The voltage at this pin should be set between 0.3V to 0.4V for normal operation. 12 SW DC/DC converter Switch. NPN output switch transistor collector. 14 EN Chip Enable input. Active high Pin Configuration 1 VDDPWR VSS 5V VSS REFOSC RFSTBY ANTM 14 EN VSS SW PC VDDRF ASK ANTP 13 12 11 10 9 8 2 3 4 5 6 7 MICRF104BM |
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