AM2315 datasheet(4/19 Pages) ETC1

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Table 4: AM2315 DC Characteristics。

Parameter

Condition

min

typ

max

Unit

Supply voltage

3.3

5.5

Power

[4]

Dormancy

Measuring

500

Average

300

Low-level output

IOL

[5]

300

High output

Rp<25 kΩ

90%

100%

VDD

Low input voltage

Decline

30%

VDD

Input High

Rise

70%

100%

VDD

Rpu

[6]

VDD = 5V

VIN = VSS

Ω

Output current

Off

Sampling period

7、I

2C Communication protocol

7.1 I

2C communication protocol introduced

7.1.1

2C About the bus

AM2315 and micro-processor control interface form of the I

2C serial bus, in this brief introduction

about the I

2C bus protocol standard. Due to space limitations, the agreement can not list the entire contents of

a deeper problem, please refer to the relevant information (refer to the Philips site inspection).

7.1.2

2C Bus Overview

Philips (Philips) at 20 years ago invented a simple two-way two-wire serial communication bus, the bus

is known as the Inter-I

2C bus. I2C bus has now become the industry standard solution for embedded

applications, is widely used in variety of microcontroller-based professional, consumer and

telecommunications products, as a control, diagnostics and power management bus. More in line with

standard I

2C bus devices can communicate with an I2C bus, without the need to address decoder.

2C bus only composed by the two signal lines, a serial data line SDA, the other root is the serial clock

line SCL. I

2C bus devices generally have their SDA and SCL pins are open-drain (or open collector) output

structure. Therefore, the actual use, SDA and SCL signal lines must be pull-up resistor (Rp, Pull-Up

Resistor). Pull-up resistor on the general value of 3 ~ 10 kΩ . Therefore, when the bus is free, the two signal

lines remain high, almost no current consumption; electrical compatibility, and supports a variety of different

voltage logic interface; different between the two can be directly connected to the bus, not require additional

conversion circuitry to support a variety of ways a master multi-slave communication is the most common

means of communication. It also supports dual-host communications, multi-host communications, and

broadcast mode, and so on.

2C typical configuration is shown in Figure 4。

[1] The accuracy of the factory test, the sensor at

25 ℃ and 5V, the accuracy of indicators under

the conditions tested, it does not include hysteresis

and non-linear, and only for non-condensing

environment.

[2] at 25 ℃ and 1m / s air flow conditions, to

reach 63% of first-order response time required.

[3] in volatile organic compounds, the values may

be higher. See manual application to store

information.

[4] This value is VDD = 5.0V, when the

temperature is 25 ℃, 2S / time, average

conditions.

[5] low output current.

[6] that pull-up resistor.

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