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AFE4403 Datasheet(PDF) 4 Page - Texas Instruments |
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AFE4403 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 97 page  AFE4403 SBAS650B – MAY 2014 – REVISED JULY 2014 www.ti.com Pin Functions PIN NAME NO. FUNCTION DESCRIPTION Output signal that indicates ADC conversion completion. ADC_RDY D5 Digital Can be connected to the interrupt input pin of an external microcontroller. AFE-only power-down input; active low. AFE_PDN C3 Digital Can be connected to the port pin of an external microcontroller. Decoupling capacitor for internal band-gap voltage to ground. Connect a decoupling capacitor to ground. BG C2 Reference To achieve the lowest transmitter noise, use a capacitor value of 2.2 µF. To reduce the recovery time from power-down (from 1 s to 0.1 s), use a capacitor value of 0.1 µF instead—but with slightly degraded transmitter noise. Buffered 4-MHz output clock output. CLKOUT E6 Digital Can be connected to the clock input pin of an external microcontroller. Output signal that indicates completion of diagnostics. DIAG_END B4 Digital Can be connected to the port pin of an external microcontroller. C1, A1, E3, D3, DNC(1) — Do not connect these pins. Leave as open circuit. F5, B5, B6 INN F1 Analog Receiver input pin. Connect to photodiode anode. INP E1 Analog Receiver input pin. Connect to photodiode cathode. LED_DRV_GND A3 Supply LED driver ground pin, H-bridge. Connect to common board ground. LED driver supply pin, H-bridge. Connect to an external power supply capable of supplying the LED_DRV_SUP A6 Supply large LED current, which is drawn by this supply pin. AFE-only reset input, active low. RESET D4 Digital Can be connected to the port pin of an external microcontroller RX_ANA_GND E2 Supply Rx analog ground pin. Connect to common board ground. RX_ANA_SUP F2, E4 Supply Rx analog supply pin; 0.1-µF decoupling capacitor to ground RX_DIG_GND B2, F6 Supply Rx digital ground pin. Connect to common board ground. RX_DIG_SUP E5 Supply Rx digital supply pin; 0.1-µF decoupling capacitor to ground SCLK C6 SPI SPI clock pin SPISIMO C4 SPI SPI serial in master out SPISOMI C5 SPI SPI serial out master in SPISTE D6 SPI SPI serial interface enable TX_CTRL_SUP A2 Supply Transmit control supply pin (0.1-µF decoupling capacitor to ground) Transmitter reference voltage, 0.25 V default after reset. Connect a decoupling capacitor to ground. TX_REF B1 Reference To achieve the lowest transmitter noise, use a capacitor value of 2.2 µF. To reduce the recovery time from power-down (from 1 s to 0.1 s), use a capacitor value of 0.1 µF instead—but with slightly degraded transmitter noise. TXN A4 Analog LED driver out. Connect to LED in common anode or H-bridge configuration. TXP A5 Analog LED driver out. Connect to LED in common anode or H-bridge configuration. LED driver out for third LED. Connect to optional third LED supported in common anode TX3 B3 Analog configuration. Input common-mode voltage output. This signal can be used to shield (guard) the INP, INN traces. VCM D1 Reference If used as a shield, then connect a series resistor (1 k Ω) and a decoupling capacitor (10 nF) to ground. If VCM is not used externally, then these external components are not required. VSS D2 Supply Substrate ground. Connect to common board ground. Crystal oscillator pins. XOUT F4 Digital Connect an external crystal between these pins with the correct load capacitor (as specified by vendor) to ground. Crystal oscillator pins. XIN F3 Digital Connect an external crystal between these pins with the correct load capacitor (as specified by vendor) to ground. (1) Leave pins as open circuit. Do not connect. 4 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: AFE4403 |
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