component
SSP721A
Public Made by Adomby adom
Shanghai Siproin Microelectronics RF Transceiver ICs, SOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"number": "1",
"name": "BUSL2",
"type": "passive",
"description": "Connects to the meter bus; the BUSL2-BUSL1 bus voltage is rated ±50 V absolute maximum, with 10.8-42 V recommended for receive and 12-42 V for transmit."
},
{
"number": "2",
"name": "VB",
"type": "power_in",
"description": "Rectified bus signal node after the bridge rectifier, for which the datasheet lists a 9.3 V receive-mode input voltage condition."
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{
"number": "3",
"name": "STC",
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"description": "External power-holding capacitor node, where the basic application requires CSTC above 50 µF and STC reads 5.6-6.4 V with VDD on."
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{
"number": "4",
"name": "RIDD",
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},
{
"number": "5",
"name": "PF",
"type": "output",
"description": "Undervoltage indication output, specified at 0-0.6 V low (IPF=−1 µA) and VBAT−0.6 V high (IPF=−100 µA)."
},
{
"number": "6",
"name": "SC",
"type": "passive",
"description": "External sampling capacitor node, with SC charge current specified at −15 µA minimum and −40 µA typical."
},
{
"number": "7",
"name": "TXI",
"type": "output",
"description": "Inverted data signal output, with VOL at most 0.5 V and VOH at least VBAT−0.6 V under 100 µA load."
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{
"number": "8",
"name": "TX",
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"description": "Data signal output, with VOL at most 0.5 V and VOH at least VBAT−0.6 V under 100 µA load."
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{
"number": "9",
"name": "BAT",
"type": "input",
"description": "Logic-level adjustment input, recommended at 2.5-3.8 V, must not exceed VSTC−1 V, and is absolute-rated to −0.3 to 5.5 V."
},
{
"number": "10",
"name": "VS",
"type": "power_in",
"description": "Output that switches between bus-powered and battery-powered supply modes, with output resistance of 0.3-1 MΩ when VDD is off."
},
{
"number": "11",
"name": "VDD",
"type": "power_out",
"description": "Regulated supply output of 3.1-3.4 V at 1 mA with STC at 6.5 V, and output resistance of 5 Ω for 2-8 mA."
},
{
"number": "12",
"name": "RX",
"type": "input",
"description": "Data signal input, with absolute range −0.3 to 5.5 V, high level of VBAT−0.8 V minimum (up to 5.5 V when VSTC≥6.5 V), and low level of 0.8 V maximum."
},
{
"number": "13",
"name": "RXI",
"type": "input",
"description": "Inverted data signal input, with absolute range −0.3 to 5.5 V and input current of 10-40 µA when VRXI=VBAT=3 V."
},
{
"number": "14",
"name": "RIS",
"type": "passive",
"description": "Connects the external modulation-current setting resistor, with a minimum of 100 Ω, giving 11.5-19.5 mA modulation current at 100 Ω."
},
{
"number": "15",
"name": "GND",
"type": "power_in",
"description": "Ground reference; all voltages in the datasheet are referenced to the GND pin."
},
{
"number": "16",
"name": "BUSL1",
"type": "passive",
"description": "Connects to the meter bus as the other end of the BUSL2-BUSL1 pair, which is rated ±50 V absolute maximum."
}
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"at": "2026-11-05T05:26:09"
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"metadata": {
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"Package": "SOP-16",
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"name": "工作环境温度",
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{
"name": "仪表总线间电压（BUSL2-BUSL1）接收",
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"min": 10.8,
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{
"name": "仪表总线间电压（BUSL2-BUSL1）发送",
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"min": 12,
"typ": null,
"max": 42,
"conditions": "发送",
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{
"name": "输入电压 VB（接收）",
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{
"name": "外接 CS1 电流值调节电阻",
"symbol": "RRIDD",
"kind": "recommended_operating",
"unit": "KΩ",
"min": 13,
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"max": 80,
"conditions": "",
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{
"name": "外接调制电流值调节电阻",
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{
"name": "工作环境温度（推荐）",
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"typ": null,
"max": 80,
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{
"name": "整流桥 BR 上的压降",
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"conditions": "IBUS=3mA",
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{
"name": "电流源 CS1 上的压降",
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{
"name": "总线电流",
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{
"name": "总线电流",
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{
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{
"name": "供电电流",
"symbol": "ICC",
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{
"name": "CI1 电流",
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{
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{
"name": "BAT 端与 VDD 端电流和",
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"conditions": "VBUS=0V, VSTC=0V",
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{
"name": "VDD 端电压",
"symbol": "VVDD",
"kind": "electrical",
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"min": 3.1,
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"max": 3.4,
"conditions": "-IVDD=1mA, VSTC=6.5V",
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{
"name": "VDD 电阻",
"symbol": "RVDD",
"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": null,
"max": 5,
"conditions": "-IVDD=2～8mA, VSTC=4.5V",
"source_page": 3,
"source": "datasheet"
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{
"name": "STC 电压",
"symbol": "VCTC",
"kind": "electrical",
"unit": "V",
"min": 5.6,
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"conditions": "VDD=on, VS=on",
"source_page": 3,
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{
"name": "STC 电压",
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"min": 3.8,
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"conditions": "VDD=off, VS=off",
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{
"name": "STC 电压",
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{
"name": "STC 电流",
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"kind": "electrical",
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"min": 1.85,
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"conditions": "VSTC=5V, RRIDD=13kΩ",
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{
"name": "STC 电流",
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{
"name": "RIDD 端电压",
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{
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{
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{
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{
"name": "启动时间",
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{
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"name": "TX/TXI 端输出低电平",
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{
"name": "TX/TXI 端输出低电平",
"symbol": "VOL",
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"unit": "V",
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"typ": null,
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