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TRF7960 Datasheet(PDF) 11 Page - Texas Instruments |
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TRF7960 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 51 page  TRF7960 TRF7961 www.ti.com SLOU186F – AUGUST 2006 – REVISED AUGUST 2010 5 System Description 5.1 Power Supplies The positive supply pin, VIN (pin 2) has an input voltage range of 2.7 V to 5.5 V. The positive supply input sources three internal regulators with output voltages VDD_RF, VDD_A and VDD_X that use external bypass capacitors for supply noise filtering. These regulators provide enhanced PSRR for the RFID reader system. The regulators are not independent and have common control bits for output voltage setting. The regulators can be configured to operate in either automatic or manual mode. The automatic regulator mode setting ensures an optimal compromise between regulator PSRR and highest possible supply voltage for RF output power. Whereas, the manual mode allows the user to manually configure the regulator settings. VDD_RF The regulator VDD_RF (pin 3) is used to source the RF output stage. The voltage regulator can be set for either 5-V or 3-V operation. When configured for the 5-V operation, the output voltage can be set from 4.3 V to 5 V in 100-mV steps. The current sourcing capability for 5-V operation is 150 mA maximum over the adjusted output voltage range. When configured for 3-V operation, the output can be set from 2.7 V to 3.4 V, also in 100-mV steps. The current sourcing capability for 3-V operation is 100 mA maximum over the adjusted output voltage range. VDD_A Regulator VDD_A (pin 1) supplies voltage to analog circuits within the reader chip. The voltage setting is divided in two ranges. When configured for 5-V operation, the output voltage is fixed at 3.5 V. When configured for 3-V operation, the output can be set from 2.7 V to 3.4 V in 100-mV steps. Note that when configured, both VDD_A and VDD_X regulators are configured together (their settings are not independent). VDD_X Regulator VDD_X (pin 32) can be used to source the digital I/O of the reader chip together with other external system components. When configured for 5-V operation, the output voltage is fixed at 3.4 V. When configured for 3-V operation, the output voltage can be set from 2.7 to 3.4 V in 100-mV steps. The total current sourcing capability of the VDD_X regulator is 20 mA maximum over the adjusted output range. Note that when configured, both VDD_A and VDD_X regulators are configured together (their settings are not independent). VDD_PA The VDD_PA pin (pin 4) is the positive supply pin for the RF output stage and is externally connected to the regulator output VDD_RF (pin 3). 5.1.1 Negative Supply Connections The negative supply connections are all externally connected together (to GND). The substrate connection is VSS (pin 10), the analog negative supply is VSS_A (pin 15), the logic negative supply is VSS_D (pin 29), the RF output stage negative supply is VSS_TX (pin 6), and the negative supply for the RF receiver input is VSS_RX (pin 7). 5.1.2 Digital I/O Interface To allow compatible I/O signal levels, the TRF7960/61 has a separate supply input VDD_I/O (pin 16), with an input voltage range of 1.8 V to 5.5 V. This pin is used to supply the I/O interface pins (I/O_0 to I/O_7), IRQ, SYS_CLK, and DATA_CLK pins of the reader. In typical applications, VDD_I/O is connected directly to VDD_X to ensure that the I/O signal levels of the MCU are the same as the internal logic levels of the reader. Copyright © 2006–2010, Texas Instruments Incorporated System Description 11 Submit Documentation Feedback focus.ti.com: TRF7960 TRF7961 |
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