Datasheet > ADPD188BI-ACEZR7

ADPD188BI-ACEZR7

更新时间： 2024-02-13 03:37:46

品牌	Logo	应用领域
亚德诺 - ADI		/
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62页	1219K
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Integrated Optical Module for Smoke Detection

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ADPD188BI-ACEZR7 数据手册

Integrated Optical Module for

Smoke Detection

Data Sheet

ADPD188BI

FEATURES

GENERAL DESCRIPTION

3.8 mm × 5.0 mm × 0.9 mm module with integrated optical

components

1 blue LED, 1 IR LED, and 2 photodiodes

2 external inputs for other sensors (for example, carbon

monoxide (CO) and temperature)

The ADPD188BI is a complete photometric system for smoke

detection using optical dual wavelength technology. The module

integrates a highly efficient photometric front end, two light

emitting diodes (LEDs), and two photodiodes (PDs). These

items are housed in a custom package that prevents light from

going directly from the LED to the photodiode without first

entering the smoke detection chamber.

Three 370 mA LED drivers

20-bit burst accumulator enabling 20 bits per sample period

On-board sample to sample accumulator enabling up to

27 bits per data read

Optimized SNR for signal limited cases

I²C or SPI communications

The front end of the application specific integrated circuit

(ASIC) consists of a control block, a 14-bit analog-to-digital

converter (ADC) with a 20-bit burst accumulator, and three

flexible, independently configurable LED drivers. The control

circuitry includes flexible LED signaling and synchronous

detection. The analog front end (AFE) features best-in-class

rejection of signal offset and corruption due to modulated

interference commonly caused by ambient light. The data

output and functional configuration occur over a 1.8 V I²C

interface or serial peripheral interface (SPI) port.

APPLICATIONS

Smoke detection

FUNCTIONAL BLOCK DIAGRAM

VDD1

VDD2

PDC

ADPD188BI

PD1

EXT_IN1

CH1

BPF

±1 INTEGRATOR

TIA_VREF

VREF

PD2

1µF

EXT_IN2

CH2

TIA_VREF

PDC

PDET1

PD3

CH3

BPF

±1 INTEGRATOR

SCLK

MOSI

MISO

TIME SLOT A

DATA

TIA_VREF

PDET2

PD4

14-BIT

ADC

CH4

TIME SLOT B

DATA

SDA

SCL

VLED1

AFE CONFIGURATION,

TIME SLOT A

TIA_VREF

VLED3

AFE CONFIGURATION,

TIME SLOT B

GPIO0

GPIO1

BLUE

DIGITAL

INTERFACE

AND

LED1/DNC

CONTROL

LED1 DRIVER

LED3/DNC

LED2

LED3 DRIVER

LED2 DRIVER

LGND

AGND

DGND

NOTES

1. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN WHEN USING INTERNAL LEDs.

Figure 1.

Rev. B

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice.

No license is granted by implication or otherwise under any patent or patent rights of Analog

Devices. Trademarks and registeredtrademarks arethe propertyoftheir respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Technical Support

www.analog.com

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