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SN65HVD82DR

Type: Transceiver

Protocol: RS422, RS485

Number of drivers/receivers: 1/1

Duplex: Half

Receiver Lag: 60mV

Data rate: 250kbps

Voltage - Power: 4.5 V ~ 5.5 V

Operating temperature: -40°C ~ 85°C

Mounting Type: Surface Mount

Package/Case: 8-SOIC

APM32F103RBT6

SD5820A digital temperature sensor, the selected digital temperature sensor SD5820A adopts TO-92 package, which has the characteristics of small size and convenient use. In order to measure the temperature of the liquid, the SD5820A chip is put into a stainless steel protective tube and sealed, which has the functions of wear resistance, impact resistance, waterproof and so on. SD5820A only needs one I/O port line to realize two-way communication when connecting with the single-chip microcomputer, which occupies less ports of the single-chip microcomputer and can save a lot of leads and logic circuits. The measured temperature is serially output in a sign-extended 12-bit digital mode. The temperature measurement range is -55 to +125 °C, the temperature measurement resolution can reach 0.0625 °C, and the temperature measurement error is within ± 10 °C to +85 °C. Within 0.5℃, the temperature measurement error is within ±0.8℃ at -55℃～+125℃.

The working power supply of the digital temperature sensor SD5820A is introduced at the remote end. The DIO pin of SD5820A is connected with the I/O pin of the single-chip microcomputer for communication between the two parties, and a 4.7kΩ resistor is used to pull up. Since the single-line communication function of SD5820A is completed in time-sharing, the system must perform its operations strictly according to the protocol. Refer to SD5820A single bus digital temperature sensor specification for operation protocol.

BL24C02F

BL8064-33

BL806418

BL8028

BLM2302

BLM2305

BL2555

The analog switch RS2105 is used to switch the red LED and the infrared LED. They are time-multiplexed and modulated with a certain frequency. The op amp RS321 cooperates with the DAC inside the MCU to generate a constant current output signal, because the constant current operation of the LED light can be compared. At stable wavelength, the emission current often reaches tens of mA, so the on-resistance of the analog switch is required to be preferably less than 1Ω, and the on-resistance of RS2105 is 0.6Ω, which meets the application requirements.

On the photosensitive receiver side, the op amp RS622 is used to realize photoelectric conversion, which requires the input bias current Ib of the op amp to be pA level, and the bandwidth of the op amp needs to be more than 5MHz to meet the fast response, low noise series of op amps Can better improve the resolution of the system. In terms of power supply topology, one is to use two dry batteries (3V), then boost to 5V, and then step down for use in each circuit of the system, and the other is to use lithium batteries, which can be recharged and used. Low-power LDO RS3236 is suitable for this. Two topological systems.

RS622XM

RS2105XTDC10

RS3236-3.3YF5

GX18B20

GX18B20W

GX18B20U

GX1820

GX18B20S

GX18B20

GX18B20H

GX20ME04

GX18B20S

GX20MH02

GX20MH01

GX20M04W

GX25M05

GX26M08

GX21M15

GS8551 is available in SOT23-5 and SOP-8 packages, GS8552 is available in MSOP-8 and SOP-8 packages, GS8554 is available in SOP-14 and TSSOP-14 packages, GS855X amplifiers are single/dual/quad supply, micro-power, zero-drift CMOS Operational Amplifiers, these amplifiers offer 1.8MHz bandwidth, rail-to-rail input and output, and single-supply operation from 1.8V to 5.5V. The GS855X uses chopper stabilization to provide very low offset voltages (values less than 5µV) with near-zero drift over temperature.

The quiescent supply current per amplifier is as low as 180µA, and the input bias current is very low at 20pA, making these devices ideal for low offset, low power, and high impedance applications. The GS855X provides excellent CMRR without the dividers associated with traditional complementary input stages. This design provides excellent performance in driving analog-to-digital converters (ADCs) without degrading differential linearity.

The GS8551 is available in SOT23-5 and SOP-8 packages. The GS8552 is available in MSOP-8 and SOP-8 packages. The GS8554 Quad is available in green SOP-14 and TSSOP-14 packages. The extended temperature range of -45oC to +125oC provides additional design flexibility at all supply voltages.

EXB24AT1AR3X