ADI采用3軸數(shù)字加速度計的ADXL345血壓計解決方案

作者：時間：2012-05-30 來源：網(wǎng)絡(luò)

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The ADuM4160 uses the edge detection based iCoupler tech-nology in conjunction with internal logic to implement a transparent, easily configured, upstream facing port isolator. Isolating an upstream facing port provides several advantages in simplicity, power management, and robust operation.

The isolator has propagation delay comparable to that of a standard hub and cable. It operates with the supply voltage on either side ranging from 3.1 V to 5.5 V, allowing connection directly to VBUS by internally regulating the voltage to the signaling level. The ADuM4160 provides isolated control of the pull-up resistor to allow the peripheral to control connection timing. The device has a low idle current; a suspend mode is required.

ADuM4160主要特性:

USB 2.0 compatible

Low and full speed data rate: 1.5 Mbps and 12 Mbps

Bidirectional communication

Short-circuit protection for xD+ and xD? lines

3.3 V and 5 V (dual mode power configuration) operation

7 mA maximum upstream supply current @ 1.5 Mbps

8 mA maximum upstream supply current @ 12 Mbps

2.3mA maximum upstream idle current

Class 3A contact ESD performance per ANSI/ESD STM5.1-2007

High temperature operation: 105℃

High common-mode transient immunity: >25 kV/μs

16-lead SOIC wide-body package

RoHS compliant

Safety and regulatory approvals

UL recognition: 5000 V rms for 1 minute per UL 1577 (pending)

CSA Component Acceptance Notice #5A

IEC 60601-1: 125 V rms (reinforced)

IEC 60950-1: 380 V rms (reinforced)

VDE certificate of conformity (pending)

DIN V VDE V 0884-10 (VDE V 0884-10):2006-12

VIORM = 846 V peak

ADuM4160應(yīng)用:

USB peripheral isolation

Isolated USB hub

圖5.ADuM4160方框圖

圖6.ADuM4160典型應(yīng)用

CapTouch Programmable Controller for Single-Electrode Capacitance Sensors AD7147

The AD7147 CapTouch? controller is designed for use with capacitance sensors implementing functions such as buttons, scroll bars, and wheels. The sensors need only one PCB layer, enabling ultrathin applications.

The AD7147 is an integrated CDC with on-chip environmental calibration. The CDC has 13 inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (Σ-Δ) converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. By programming the registers, the user has full control over the CDC setup.

High resolution sensors require minor software to run on the host processor.

The AD7147 is designed for single electrode capacitance sensors (grounded sensors). There is an active shield output to minimize noise pickup in the sensor.

The AD7147 has on-chip calibration logic to compensate for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals as long as the sensors are not touched. This ensures that there are no false or nonregistering touches on the external sensors due to a changing environment.

The AD7147 has an SPI-compatible serial interface, and the AD7147-1 has an I2C?-compatible serial interface. Both parts have an interrupt output, as well as a GPIO. There is a VDRIVE pin to set the voltage level for the serial interface independent of VCC.

The AD7147 is available in a 24-lead, 4 mm × 4 mm LFCSP and operates from a 2.6 V to 3.6 V supply. The operating current con-sumption in low power mode is typically 26 μA for 13 sensors.

AD7147主要特性:

Programmable capacitance-to-digital converter (CDC)

Femtofarad resolution

13 capacitance sensor inputs

9 ms update rate, all 13 sensor inputs

No external RC components required

Automatic conversion sequencer

On-chip automatic calibration logic

Automatic compensation for environmental changes

Automatic adaptive threshold and sensitivity levels

On-chip RAM to store calibration data

SPI-compatible (serial-peripheral-interface-compatible) serial interface (AD7147)