AMS AS6204 Manual de usuario

User Guide

UG000440

AS6204

Eval Kit

AS6204-EK

v1-01 •2019-Apr-17

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AS6204

Content Guide

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Content Guide

1Introduction....................................3

1.1 Kit Content.................................................... 3

1.2 Ordering Information .................................... 3

2Getting Started...............................4

3Hardware Description....................5

3.1 Hardware Architecture .................................5

3.2 AS6204 Configuration.................................. 6

3.3 Power Supply and Connections................... 6

4Software Description.....................7

4.1 Index Register.............................................. 7

4.2 Temperature Register...................................8

5Schematics, Layers and BOM ...... 9

5.1 Schematics....................................................9

5.2 Layout and Board Dimensions......................9

5.3 Bill of Materials........................................... 11

6Revision Information................... 12

7Legal Information ........................ 13

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AS6204

Introduction

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1 Introduction

The AS6204 adapter board is a small PCB allowing a simple and quick evaluation of the AS6204

digital temperature sensors without the need to design a custom PCB. This small form factor board is

fully assembled with the AS6204 temperature sensor and its necessary external components.

1.1 Kit Content

This kit contains following material listed in Figure 1

Figure 1:

Kit Content

Pos.

Item

Comment

AS6204-EK-AB

Eval Kit Adapter Board

1.2 Ordering Information

Figure 2:

Ordering Code

Description

AS6204-EK

AS6204 Eval Kit

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Getting Started

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2 Getting Started

The AS6204 adapter board is ideal for rapid setup of a digital temperature sensor. To get started

connect the board to your microcontroller configuration as described in Figure 4. Add a command in

your source code to request two bytes from the selected I²C address. Finally convert the returned data

as described in chapter 4.2 to get the actual temperature value.

Figure 3:

Adapter Board

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Hardware Description

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3 Hardware Description

The P1 connector does provide all relevant signals, which can be easily wired to a microcontroller and

to the power supply

Figure 4:

Adapter Board Pin-Out

Symbol

Description

Info

SCL

I²C clock

Use R1 if pull-up is required

SDA

I²C data

Use R2 if pull-up is required

GND

Ground

VDD

Power supply

According datasheet

IRQ

Digital output pin

Alert interrupt output

3.1 Hardware Architecture

Figure 5:

AS6204 Adapter Board

R1, R2 and R3 are pull-up resistors for the I²C interface and the Alert pin. Depending on the

application, it is recommended to either populate the decoupling capacitor C1 or C2.

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3.2 AS6204 Configuration

With the address selector, it is possible to choose the I²C address of the device. The included jumper

is an easy way of setting the I²C address of the sensor. The address selector must not be left open.

Figure 6:

I²C Address

Jumper Settings

Address Selector

Device Address

GND

100 1000

0x48

VDD

100 1001

0x49

SDA

100 1010

0x4A

SCL

100 1011

0x4B

3.3 Power Supply and Connections

The PCB has to be connected to an external microcontroller. P1 is populated with a 1x5 pin header

and is required for power supply as well as I²C communication. In addition to that, it can be used to

monitor the interrupt status via pin 5 (IRQ).

Figure 7:

MCU and AS6204 Connections

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Software Description

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4 Software Description

The AS6204 has 4 data registers. With the use of the index register, it is possible to address the

specific data register. When powered up the address register is set to 0x0.

Figure 8:

Data Registers

For additional configuration settings, the Config register (0x1) has to be addressed. Please refer the

data sheet for details.

Figure 9:

Configuration Register

Address

Symbol

Description

0x0

TVAL

Contains the temperature value

0x1

CONFIG

Configuration Register

Configuration settings of the

temperature sensor

0x2

TLOW

TLOW Register

Low temperature threshold value

0x3

THIGH

THIGH Register

High temperature threshold value

4.1 Index Register

The index register contains 8-bit, but only D0 and D1 are used.

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Figure 10:

Index Register

Bit

Value

Address Bits

4.2 Temperature Register

Figure 11:

Temperature Register

D15

D14

D13

D12

D11

D10

T11

T10

MSB Byte

LSB Byte

The temperature register contains the digitally converted temperature value. It consists of 2 bytes and

can be converted according to the following formula:

Positive values= |Value| / LSB

Negative values= Complement( |Value| / LSB ) + 1

Example +75°C

75°𝐶/ 0.0625°𝐶= 1200 = 𝐵𝑖𝑛𝑎𝑟𝑦 0100 1011 0000 = 𝐻𝑒𝑥 4𝐵0

Example -40°C

|−40°𝐶| / 0.0625°𝐶+ 1 = 640 + 1 = 𝐵𝑖𝑛𝑎𝑟𝑦 0010 1000 0000 + 1 = 1101 0111 1111 + 1 =

1101 10000 0000 = 𝐻𝑒𝑥 𝐷80

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Schematics, Layers and BOM

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5 Schematics, Layers and BOM

The schematics, layout and BOM of the adapter board are shown below for reference.

5.1 Schematics

The schematics of the board is shown below in Figure 12:

Figure 12:

Schematics

5.2 Layout and Board Dimensions.

The PCB layout is shown below in Figure 13 and Figure 14

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Schematics, Layers and BOM

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Figure 13:

Top Layer

Figure 14:

Bottom Layer

The board dimensions are shown below in Figure 15

Figure 15:

Dimensions

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