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LDC0851 是一款近距离感应开关,非常适合存在检测和事件计数等非接触式简单开关应用。
当导电物体进入感应线圈的接近范围内时将触发开关。该器件包含滞后功能,可保证可靠的开关阈值。差分实现方案可防止因温度变化或湿度影响等环境因素而导致误触发。LDC0851 无需 MCU 即可工作,因此可实现简单的解决方案。
电感式传感技术即使在有尘土、油污或潮气的环境中也可实现可靠而准确的感应,因此非常适合严苛或脏污的环境。固态开关消除了磁簧、机械或接触开关常会引发的失败。与同类竞争产品不同的是,LDC0851 无需使用磁体,而且不受直流磁场的影响。
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
LCOM | 1 | A | Common coil input |
LSENSE | 2 | A | Sense coil input |
LREF | 3 | A | Reference coil input |
ADJ | 4 | A | Threshold adjust pin |
OUT | 5 | O | Switch output |
EN | 6 | I | Enable input |
GND | 7 | G | Ground |
VDD | 8 | P | Power Supply |
DAP | DAP | G | Connect to Ground for improved thermal performance(2) |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VDD | Supply Voltage Range | 3.6 | V | |
Vi | Voltage on LSENSE, LREF, and EN | -0.3 | 3.6 | V |
Voltage on ADJ and LCOM | -0.3 | 2 | V | |
IA | Current LSENSE, LREF, and VOUT | 5 | mA | |
TJ | Junction Temperature | -55 | 150 | °C |
Tstg | Storage Temperature | -65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±1000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±250 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
VDD | Supply Voltage | 1.71 | 3.46 | V | |
TA | Operating Temperature | -40 | 125 | °C |
THERMAL METRIC(1) | LDC0851 | UNIT | ||
---|---|---|---|---|
DSG (WSON) | ||||
8 PINS | ||||
RθJA | Junction-to-ambient thermal resistance | 67.4 | °C/W | |
RθJC(top) | Junction-to-case (top) thermal resistance | 89.3 | °C/W | |
RθJB | Junction-to-board thermal resistance | 37.3 | °C/W | |
ψJT | Junction-to-top characterization parameter | 2.4 | °C/W | |
ψJB | Junction-to-board characterization parameter | 37.7 | °C/W | |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 9.2 | °C/W |
PARAMETER | TEST CONDITIONS | MIN(2) | TYP(3) | MAX(2) | UNIT | |
---|---|---|---|---|---|---|
POWER | ||||||
VDD | Supply Voltage | 1.71 | 3.46 | V | ||
ISTATIC | Static Supply Current (4) | 0.70 | mA | |||
IDYN | Dynamic Supply Current (not including sensor current)(4) | ƒSENSOR = 15 MHz
CPARASITIC = 22 pF | 0.66 | mA | ||
ISD | Shutdown Mode Supply Current | 0.14 | 1 | µA | ||
SENSOR | ||||||
ISENSOR_MAX | Maximum sensor current(4) | VDD = 1.71 V | 4.35 | mA | ||
VDD = 3.3 V | 6 | mA | ||||
LSENSOR_MIN | Sensor Minimum Inductance(5) | CTOTAL = 33 pF
VDD = 1.71 V | 2.5 | |||
CTOTAL = 33 pF
VDD = 3.3 V | 1.8 | µH | ||||
ƒSENSOR_MAX | Max Sensor Resonant Frequency(5) | Sensor inductance = 2 µH
CTOTAL = 33 pF | 19 | MHz | ||
CTOTAL | Minimum total capacitance on LCOM(5) Includes parasitic pin capacitance and PCB parasitic capacitance | 33 | pF | |||
CIN | Pin parasitic capacitance on LCOM | 12 | pF | |||
Pin parasitic capacitance on LREF and LSENSE | 8 | pF | ||||
DETECTION | ||||||
dHYST | Switching distance hysteresis(6) | 2.5 % | ||||
dTOL | Switching threshold tolerance(6) | 0.1 % | ||||
THRESHOLD ADJUST | ||||||
VADJ | Adjust input range | 0 | VDD/2 | V | ||
VADJ_TOL | Adjust threshold tolerance | ± 6 | mV |