AMS AS621 Series Bedienungsanleitung

User Guide

UG000452

AS621x

Eval Kit

AS6212-EK, AS6214-EK & AS6218-EK

v1-01 •2019-Oct-08

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AS621x

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 AS621x Configuration .................................. 6

3.3 Power Supply and Connections................... 7

4Software Description.....................8

4.1 Index Register.............................................. 8

4.2 Temperature Register...................................9

5Schematics, Layers and BOM .... 11

5.1 Schematics................................................. 11

5.2 Layout and Board Dimensions................... 11

5.3 Bill of Materials........................................... 13

6Revision Information................... 14

7Legal Information ........................ 15

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AS621x

Introduction

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1 Introduction

The AS621x Eval Kit is a small PCB allowing a simple and quick evaluation of the AS621x digital

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

assembled with the AS621x 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

AS621x-EK

Eval Kit

1.2 Ordering Information

Figure 2:

Ordering Code

Description

AS6212-EK

AS6212 Eval Kit up to 0.2 °C accuracy

AS6214-EK

AS6214 Eval Kit up to 0.4 °C accuracy

AS6218-EK

AS6218 Eval Kit up to 0.8 °C accuracy

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AS621x

Getting Started

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2 Getting Started

The AS621x Eval Kit is ideal for rapid setup of a digital temperature sensor. To get started connect the

board to your microcontroller 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:

Eval Kit

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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:

Eval Kit 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

5(1)

ALERT

Digital output pin

Alert interrupt output

(1) Do not connect pin 5 to VSS. This pin should only be used for the ALERT functionality

3.1 Hardware Architecture

Figure 5:

AS621x Eval Kit

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.

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3.2 AS621x Configuration

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

are an easy way of setting the I²C address of the sensor. Both address selectors must not be left

open.

Figure 6:

I²C Address

Jumper

Settings

Address

Selector

ADD0

Address

Selector

ADD1

Device Address

Binary HEX

GND

SCL

100 0100

0x44

VDD

SCL

100 0101

0x45

SDA

SCL

100 0110

0x46

SCL

100 0111

0x47

GND

ALERT

functionality

100 1000

0x48

VDD

ALERT

functionality

100 1001

0x49

SDA

ALERT

functionality

100 1010

0x4A

SCL

ALERT

functionality

100 1011

0x4B

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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 AS621x Connections

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Software Description

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4 Software Description

The AS621x 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 to the

datasheet 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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Software Description

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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

T15

T14

T13

T12

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/ 0.0078125 °C=9600=Binary 0010 0101 1000 0000=Hex 2800

Example -40°C

|−40°𝐶/0.0078125 °𝐶 + 1 = 5120 + 1 = 𝐵𝑖𝑛𝑎𝑟𝑦 0001 0100 0000 0000 + 1 = 1110 1100 0000 0000 =

𝐻𝑒𝑥 𝐸𝐶00

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Figure 12

Temperature Conversion Examples

Temperature (°C)

Digital Output (Binary)

Digital Output (Hex)

100.0

0011 0010 0000 0000

3200

75.0

0010 0101 1000 0000

2580

50.0

0001 1001 0000 0000

1900

25.0

0000 1100 1000 0000

0C80

0.125

0000 0000 0001 0000

0010

0.0078125

0000 0000 0000 0001

0001

0.0

0000 0000 0000 0000

0000

-0.0078125

1111 1111 1111 1111

FFFF

-0.125

1111 1111 1111 0000

FFF0

-25.0

1111 0011 1000 0000

F380

-40.0

1110 1100 0000 0000

EC00

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