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BL0940

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BL(Shanghai Belling) Energy Metering ICs, TSSOP-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BL0940

BL(Shanghai Belling) · Energy Metering ICs · TSSOP-14

BL0940 from BL(Shanghai Belling), in a TSSOP-14. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VDD power_in Chip supply pin at +3.3V, with the datasheet specifying a supply range of 3.0 V to 3.6 V and absolute maximum of -0.3 V to +4 V.
2 VT input External temperature sensor signal input to the SAR ADC, whose maximum input is VDD/2 (full scale 1024 codes).
3 IP1 input Current channel analog input (differential with IN1), with a maximum differential voltage of ±50 mV (35 mV rms).
4 IN1 input Current channel analog input (differential with IP1), with a maximum differential voltage of ±50 mV (35 mV rms).
5 VP input Voltage signal input (differential with VN), with a maximum differential voltage of ±100 mV (70 mV rms).
6 VN input Voltage signal input (differential with VP), with a maximum differential voltage of ±100 mV (70 mV rms).
7 GND power_in Chip ground, referenced at 0 V for all supply and signal specifications.
8 ZX output Voltage zero-crossing indicator output, which goes low during the positive half-cycle and high during the negative half-cycle with a delay of about 570 µs relative to the input signal.
9 CF output Energy pulse output whose function is multiplexed by the MODE register (energy pulse, over-current/leakage alarm, or temperature alarm), with a 50% duty cycle for periods under 180 ms.
10 SEL input UART/SPI mode select (0 = UART, 1 = SPI) with an internal pull-down of 56.9 kΩ, so floating selects UART and tying directly to VDD selects SPI.
11 SCLK input SPI clock input (Mode 1, CPOL=0, CPHA=1, maximum 900 kHz); may be left floating in UART mode.
12 RX/SDI input Multiplexed pin serving as UART RX or SPI data input (DIN), with logic input high level at least 2.6 V and low level at most 0.8 V at VDD=3.3 V ±5%.
13 TX/SDO output Multiplexed pin serving as UART TX or SPI data output (DOUT), which requires an external pull-up resistor and outputs high level of at least VDD-0.5 V at 5 mA.
14 VPP unconnected Reserved pin that should be left floating (not connected).

Key specifications

Parameter Value
Manufacturer BL(Shanghai Belling)
Package TSSOP-14
Category Data Converters
Pins 14

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
电源 (supply voltage) VDD 3 3.6 V VDD 11
快速有效值响应时间 (50Hz, 可设置为周波/半周波) 10 40 mS 50Hz 可设置为周波/半周波 11
快速有效值响应时间 (60Hz) 8.3 33 mS 60Hz 11
逻辑输入高电平 2.6 V VDD=3.3V±5% 12
逻辑输入低电平 0.8 V VDD=3.3V±5% 12
逻辑输出低电平 0.5 V VDD=3.3V±5%, IOL=5mA 12
电源电压 (absolute) VDD -0.3 4 V T = 25 ℃ 12
模拟输入电压（相对于 GND）IP1、VP -4 4 V T = 25 ℃ 12
数字输入电压（相对于 GND）UART_SEL, RX/SDI -0.3 V T = 25 ℃ 12
数字输出电压（相对于 GND）CF, TX/SDO -0.3 V T = 25 ℃ 12
工作温度 Topr -40 85 ℃ T = 25 ℃ (table header) 12
贮藏温度 Tstr -55 150 ℃ T = 25 ℃ (table header) 12
功耗 Iop 3 mA VDD=3.3V 11
有功电能测量精度（大信号） 0.2 % 35A~100mA 输入@ 1mohm 采样电阻 11
有功电能测量精度（小信号） 0.4 % 100mA~50mA 输入@ 1mohm 采样电阻 11
有功电能测量精度（微小信号） 0.6 % 50mA~10mA 输入@ 1mohm 采样电阻 11
有效值测量精度（大信号） 0.2 % 35A~100mA 输入@ 1mohm 采样电阻 11
有效值测量精度（小信号） 2 % 100mA~50mA 输入@ 1mohm 采样电阻 11
有效值测量精度（微小信号） 6 % 50mA~10mA 输入@ 1mohm 采样电阻 11
过零信号输出延时 571 uS 11
通道间相角引起测量误差（容性） PF08err 0.5 % 相位超前 37 （PF=0.8） 11
通道间相角引起测量误差（感性） PF05err 0.5 % 相位滞后 60 （PF=0.5） 11
AC 电源抑制（输出频率幅度变化） ACPSRR 0.1 % IP/N=100mV 11
DC 电源抑制（输出频率幅度变化） DCPSRR 0.1 % VP/N=100mV 11
模拟输入电平（电流） 50 mV 电流差分输入（峰值） 12
模拟输入电平（电压） 200 mV 电压差分输入（峰值） 12
模拟输入阻抗 370 kΩ 12
SEL 下拉电阻 SEL（下拉） 56.9 kΩ 12
模拟输入带宽（-3dB） 3.5 kHz 12
内部电压基准 Vref 1.218 V 12

CAD (KiCad official)

  • Symbol: BL0940
  • Footprint: Package_SO:TSSOP-14_4.4x5mm_P0.65mm
  • 3D model: TSSOP-14 (KiCad packages3D, STEP)
  • 3D model files: bl0940-etched.step / bl0940-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bl0940.step / bl0940.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: BL(Shanghai Belling) datasheet (31 pp, sha256 da8e25f05d4e5f65, retrieved 2026-10-21, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF