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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AFE4490 데이터시트(PDF) 11 Page - Texas Instruments |
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AFE4490 데이터시트(HTML) 11 Page - Texas Instruments |
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11 / 69 page  AFE4400 www.ti.com SBAS601D – DECEMBER 2012 – REVISED MAY 2013 PIN DESCRIPTIONS NAME NO. FUNCTION DESCRIPTION Output signal that indicates ADC conversion completion. ADC_RDY 28 Digital Can be connected to the interrupt input pin of an external microcontroller. AFE-only power-down input; active low. AFE_PDN 20 Digital Can be connected to the port pin of an external microcontroller. Decoupling capacitor for internal band-gap voltage to ground. BG 7 Reference (2.2-µF decoupling capacitor to ground) Buffered 4-MHz output clock output. CLKOUT 30 Digital Can be connected to the clock input pin of an external microcontroller. Output signal that indicates completion of diagnostics. DIAG_END 21 Digital Can be connected to the port pin of an external microcontroller. DNC(1) 5, 6, 10, 34, 35 — Do not connect these pins. Leave as open circuit. INN 1 Analog Receiver input pin. Connect to photodiode anode. INP 2 Analog Receiver input pin. Connect to photodiode cathode. LED_DRV_GND 12, 13, 16 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 17, 18 Supply large LED current, which is drawn by this supply pin. Output signal that indicates an LED cable fault. LED_ALM 22 Digital Can be connected to the port pin of an external microcontroller. Output signal that indicates a PD sensor or cable fault. PD_ALM 23 Digital Can be connected to the port pin of an external microcontroller. AFE-only reset input, active low. RESET 29 Digital Can be connected to the port pin of an external microcontroller RX_ANA_GND 3, 36, 40 Supply Rx analog ground pin. Connect to common board ground. RX_ANA_SUP 33, 39 Supply Rx analog supply pin; 0.1-µF decoupling capacitor to ground RX_DIG_GND 19, 32 Supply Rx digital ground pin. Connect to common board ground. RX_DIG_SUP 31 Supply Rx digital supply pin; 0.1-µF decoupling capacitor to ground SCLK 24 SPI SPI clock pin SPISIMO 26 SPI SPI serial in master out SPISOMI 25 SPI SPI serial out master in SPISTE 27 SPI SPI serial interface enable TX_CTRL_SUP 11 Supply Transmit control supply pin (0.1-µF decoupling capacitor to ground) TX_REF 9 Reference Tx reference voltage TXN 14 Analog LED driver out B, H-bridge output. Connect to LED. TXP 15 Analog LED driver out B, H-bridge output. Connect to LED. Input common-mode voltage output. VCM 4 Reference Connect a series resistor (1 k Ω) and a decoupling capacitor (10 nF) to ground. The voltage across the capacitor can be used to shield (guard) the INP, INM traces. VSS 8 Supply Substrate ground. Connect to common board ground. Crystal oscillator pins. XOUT 37 Digital Connect an external 8-MHz crystal between these pins with the correct load capacitor (as specified by vendor) to ground. Crystal oscillator pins. XIN 38 Digital Connect an external 8-MHz crystal between these pins with the correct load capacitor (as specified by vendor) to ground. (1) Leave pins as open circuit. Do not connect. Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: AFE4400 |
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