AMS AS6204 User manual

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
1
AS6204-EK-AB
Eval Kit Adapter Board
1.2 Ordering Information
Figure 2:
Ordering Code
Ordering Code
Description
AS6204-EK
AS6204 Eval Kit

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AS6204
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
Pin
Symbol
Description
Info
1
SCL
I²C clock
Use R1 if pull-up is required
2
SDA
I²C data
Use R2 if pull-up is required
3
GND
Ground
4
VDD
Power supply
According datasheet
5
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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Hardware Description
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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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AS6204
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
Register
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
D7
D6
D5
D4
D3
D2
D1
D0
Value
0
0
0
0
0
0
Address Bits
4.2 Temperature Register
Figure 11:
Temperature Register
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
T11
T10
T9
T8
T7
T6
T5
T4
T3
T2
T1
T0
0
0
0
0
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