Atmel AT73C246-EK1 User manual

11047A–PMAAC–08-Apr-10
AT73C246-EK1 Evaluation Kit
....................................................................................................................
User Guide

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AT73C246-EK1 Evaluation Kit User Guide 1-1
11047A–PMAAC–08-Apr-10
Section 1
Introduction.................................................................................................................1-1
1.1 Scope ................................................................................................................................. 1-1
1.1.1 Typical Applications: ............................................................................................ 1-1
1.2 AT73C246-EK1 Features................................................................................................... 1-2
1.3 Deliverables ....................................................................................................................... 1-3
Section 2
Getting Started............................................................................................................2-1
2.1 Electrostatic Warning ......................................................................................................... 2-1
2.2 Requirements..................................................................................................................... 2-1
2.3 PC System Requirements.................................................................................................. 2-1
2.4 Instructions......................................................................................................................... 2-2
2.4.1 To start the AT73C246-EK1 board (before using the AT73C246-EK1 software) 2-2
2.4.2 To turn off the AT73C246-EK1 evaluation board................................................. 2-2
2.5 Block Diagram.................................................................................................................... 2-3
2.6 Power Supply ..................................................................................................................... 2-4
2.7 Communication Interfaces ................................................................................................. 2-5
2.7.1 Communication Interfaces Header (J15) ............................................................. 2-5
2.8 Audio Interfaces ................................................................................................................. 2-6
2.9 Output Voltages ................................................................................................................. 2-7
2.10 Input/Output Signals........................................................................................................... 2-8
2.10.1 ADC ..................................................................................................................... 2-8
2.10.2 CLK32K - RTC Output Clock ............................................................................... 2-8
2.10.3 LED...................................................................................................................... 2-8
2.10.4 Wakeup Push Buttons ......................................................................................... 2-9
2.10.5 LDOs Optional Programming Enable .................................................................. 2-9
Section 3
AT73C246-EK1 Software Interface ............................................................................3-1
3.1 Software Panel................................................................................................................... 3-1
3.1.1 Login .................................................................................................................... 3-1
3.1.2 Login Errors ......................................................................................................... 3-1
3.1.3 Functionality and Control Pages .......................................................................... 3-3
Section 4
USB-to-Serial Card .....................................................................................................4-1
4.1 USB-to-Serial Card Features ............................................................................................. 4-1
4.2 Electrostatic Warning ......................................................................................................... 4-1
4.3 Requirements..................................................................................................................... 4-1
4.4 Instructions......................................................................................................................... 4-2

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4.4.1 To start the USB-to-Serial Card (after software installation)................................ 4-2
4.4.2 To turn off the USB-to-Serial Card....................................................................... 4-2
4.5 Identification LEDs ............................................................................................................. 4-2
4.6 Serial Interfaces Header .................................................................................................... 4-3
Section 5
Technical Specifications .............................................................................................5-1
5.1 AT73C246-EK1 .................................................................................................................. 5-1
Section 6
PCB Layout.................................................................................................................6-1
6.1 AT73C246-EK1 .................................................................................................................. 6-1
Section 7
Schematics .................................................................................................................7-1
Section 8
Revision History..........................................................................................................8-1
8.1 Revision History ................................................................................................................. 8-1

AT73C246-EK1 Evaluation Kit User Guide 1-1
11047A–PMAAC–08-Apr-10
Section 1
Introduction
Congratulations on your purchase of the AT73C246-EK1. It is designed to give designers a quick start to
evaluate the power management and audio capability of the AT73C246 and for prototyping and testing
of new designs.
1.1 Scope
This document describes the AT73C246-EK1. This board is designed to allow an easy evaluation of the
products using demonstration software.
To increase its capabilities for demonstration, this standalone board has two serial interfaces (TWI and
I²S via a dedicated connector), Manual Startup/Reset Control, Input/Audio Connectors, 4 x ADC Inputs,
RTC and Output Supply Voltages Terminals.
This user guide acts as a general getting started guide as well as a complete technical reference for
advanced users.
This document refers the AT73C246 datasheet.
1.1.1 Typical Applications:
Portable devices

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1.2 AT73C246-EK1 Features
The AT73C246-EK1 provides the following features:
Small size (only 70 x 70mm) with maximum available features.
Input power supply:
– External Power Supply on VIn pad (2.5V to 5.5V).
On-board audio/analog resources:
– 100dB Dynamic Range Stereo Audio DAC - 8 to 96 kHz sampling frequency,
– 4 x 96dB Dynamic Range Stereo Audio ADC - 8 to 96 kHz sampling frequency,
– 1 stereo 16/32 Ohm/20mW stereo headset (3.5mm jack connector),
– 1 stereo line in (3.5mm jack connector),
– 1 auxiliary in (3.5mm jack connector),
– 1 stereo line output (3.5mm jack connector),
– Stereo microphone inputs with bias generator,
On-board power supply resources:
– DCDC0 : 0.8 - 3.6V / 600mA,
– DCDC1 : 0.8 - 3.6V / 600mA,
– LDO2 : 0.8 - 1.9V / 300mA,
– LDO3 : 2.7 - 3.6V / 200mA,
– LDO4 : 2.7 - 3.6V / 200mA,
– LDO5 : 2.5V / 10mA - Backup battery charger and RTC supply,
Serial interfaces:
– TWI for PMU and Audio controls,
– I²S Master / Slave protocol support (for audio streaming),
RTC 32KHz output for host support.
Reset and Interrupt generation.
On-board buttons:
– Power Enable (PWREN),
– Hard Reset (HRST),
– Wakeup Sequence (WAKEUP0).

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1.3 Deliverables
The AT73C246-EK1 package contains the following items:
1. An AT73C246-EK1 board,
Figure 1-1. AT73C246-EK1 Top View (card photo)
The AT73C246 is located in the center of the AT73C246-EK1 on the Components Side.
2. USB Interface card,

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3. USB cable,
4. 20-pins flat cable,
5. One CD-ROM containing the product’s user guide, full datasheet and ready to use GUI and Com-
mand line applications.

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Figure 1-2. AT73C246-EK1 Components Side

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AT73C246-EK1 Evaluation Kit User Guide 2-1
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Section 2
Getting Started
2.1 Electrostatic Warning
The AT73C246-EK1 evaluation board is shipped in protective anti-static packaging. The board must not
be subjected to high electrostatic potentials. A grounding strap or similar protective device should be
connected when handling the board. Avoid touching the components pins or any metallic element.
2.2 Requirements
In order to set up the AT73C246-EK1 evaluation kit the following items are needed:
1. The AT73C246-EK1 evaluation board itself.
2. A DC 2.9V to 5.5V, connected to Vin pad, output power source for main supply (minimum 1 A are
required for fully operation).
3. The USB interface card with its USB cable and 20-pins flat cable.
4. Input/Output devices (Headset, Microphone, etc)
5. PC station with a USB connection (i.e. Universal Serial Bus) for command communication (via USB
interface card).
2.3 PC System Requirements
For a correct software operation of the AT73C246-EK1 evaluation board, the minimum hardware and
software PC requirements are:
Intel Pentium II processor
64 MB RAM
70 MB free hard disk space (for AT73C246 Evaluation board software installation)
Windows®2000/XP/VISTA
A USB connection.

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2.4 Instructions
2.4.1 To start the AT73C246-EK1 board (before using the AT73C246-EK1 software)
Install the AT73C246 software by clicking on setup.exe.
If the software is downloaded from the Atmel Web site then it is necessary to install first the National
Instrument Labview software (LabVIEW8.0.1RuntimeEngine).
Connect Input and Output devices to the AT73C246-EK1 board (into linein, Headset, Microphone,
etc..) as in Section 2.8 ”Audio Interfaces” on page 2-6,
Connect DC power supply on P1 and P2.
Connect the USB cable between the PC and the USB Interface card and when the PC requests an
“inf” driver point to “CompositeCDCSerial.inf” in USB Driver folder,
Connect the 20-pins flat cable between the to USB Interface card header and the AT73C246-EK1
board.
Launch the AT73C246 software test interface by clicking on AT73C246.exe (and follow instructions in
“AT73C246-EK1 Software Interface” on page 3-1 and “USB-to-Serial Card” on page 4-1)
Push once on PWREN button (the AT73C246-EK1 on-board “LED (D1)” should blink)
2.4.2 To turn off the AT73C246-EK1 evaluation board
Disconnect the 20-pins flat cable,
Disconnect the power supply on P1 and P2.

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2.5 Block Diagram
Figure 2-1. AT73C246-EK1 Block Diagram
LDO 6
LDO 5
LDO 4
LDO 3
LDO 2
BUCK 0
BUCK 1
POWER MANAGMENT
VDD1
VDD2
VDD3
VDD4
VBACKUP
VDDC
VDD0
CLK32K
VIN
AT73C246
20 Pins
Header I²S
TWI
AUDIO
CODEC
4 Pins
Header
Headset
Out
Line Out
Line In
Aux In
Mic In R
Mic In L
WAKEUP0
HRST
PWREN
ADC
0 to 4
AT73C246-EK1
From Extended
Card or
Microcontroller
RSTB
ITB
LED

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2.6 Power Supply
The AT73C246-EK1 is supplied by an external power supply connected on P1 (positive supply) and P2
(ground).
Figure 2-2. Power Supply Diagram
.
Note: This power supply input is NOT protected against polarization inversion.
Figure 2-3. Vin Supply Pad (P1 & P2)
Connect the power supply (+) to P1 and the ground (-) to P2.
Note: Keep G1 soldered to insure connection between the AGND (analog ground on P2) and
DGND (digital ground).
Table 2-1. Electrical Supply Requirements
Power supply source Min Max Unit
On P1 pad (minimum 1 A for fully operation) 3.1 5.5 V
LDO 6
LDO 5
LDO 4
LDO 3
LDO 2
BUCK 0
BUCK 1
AT73C246
POWER MANAGMENT
VDD1
VDD2
VDD3
VDD4
VBACKUP
VDDC
VDD0
VIN
WAKEUP0
HRST
PWREN
AT73C246-EK1
VBACKUP
AGND
P2
VDD0
Min 1A for
fully operation
P1
P1 P2
G1

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2.7 Communication Interfaces
2.7.1 Communication Interfaces Header (J15)
The following table details the pin assignments for each signal. All signal, I²S or TWI, are processed by
the USB-to-Serial module. If needed the user can drive directly these signals (using a microcontroller for
example) trough J15.
Figure 2-4. Communication Interfaces Header (J15)
Note: For a reason of I/O level configuration between the AT73C246 and an external microcon-
troller and If using another interface then the USB Communication Box, the VDD3 or VDD0
should be connect on J15 by soldering a 0 ohms resistor on its pads (see VPAD Selection
“AT73C246-EK1 Schematic - Power Supply Page” on page 7-5).
Table 2-2. Communication Interface Header Pins Assigning
Pin N° Signal Name Description Pin N° Signal Name Description
1 WAKEUP3 - 2 Vin Not Used
3 WAKEUP2 - 4 DGND Digital Ground
5 WAKEUP1 - 6 - Not Used
7 RSTB Component Reset 8 DGND Digital Ground
9 TWCK TWI Clock 10 VDDIO I/O level
11 LRFS-Signal I²S Frame Clock 12 MCLK I²S Master Clock
13 DAI-Signal I²S Data in 14 ITB Interrupt
15 DAO-Signal I²S Data out 16 - Not Used
17 BCLK-Signal I²S Bit Clock 18 - Not Used
19 - Not Used 20 TWD TWI Data I\O
J15
1
2
19
20

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2.8 Audio Interfaces
The AT73C246-EK1 CODEC interface contains various connections of audio elements:
Microphones Inputs connected to J5 and J6 (2 pins header for each input).
Auxiliary Input connected to J4 (3.5mm jack).
Line Input connected to J3 (3.5mm jack).
Line Output connected to J2 (3.5mm jack).
Headset Output connected to J1(3.5mm jack).
Please consult the product data sheet for setup options and requirements.
Figure 2-5. Microphones Inputs (J5 and J6)
Figure 2-6. Audio Inputs and Outputs (J1, J2, J3 and J4)
Microphone
Left Input
Microphone
Right Input
Auxiliary
Input
Line Input
Line Output
Headset
Output

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2.9 Output Voltages
In order to measure the output voltages connect a Volt-meter probe to the requested Test-Point by the
following list:
VDD0 - J8; 0.8 - 3.6V / 600mA
VDD1 - J9; 0.8 - 3.6V / 600mA
VDD2 - J12; 0.8 - 1.9V / 300mA
VDD3 - J13; 2.7 - 3.6V / 200mA
VDD4 - J19; 2.7 - 3.6V / 200mA
VBACKUP - J10; 2.5V / 10mA (an additional connector J11 is available for rechargeable coin type
battery)
Figure 2-7. Output Voltages Test-Points (J8, J8, J12, J13, J19)
Figure 2-8. VBACKUP and VCOIN (J10 and J11)
VDD3
VDD2
VDD1
VDD0
VDD4
VBACKUP
VCOIN

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2.10 Input/Output Signals
2.10.1 ADC
Connect an external analog signal to ADC connector J14.
Figure 2-9. ADC connector (J14)
2.10.2 CLK32K - RTC Output Clock
The AT73C246-EK1 provides measuring the internal oscillator frequency (J7).
Figure 2-10. CLK32K (J7)
2.10.3 LED
The programmable output LED pin can be visualize by the on board led (D1).
Figure 2-11. LED (D1)
ADC 0 to 3
RTC Output
Clock
Led

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2.10.4 Wakeup Push Buttons
The AT73C246-EK1 provides 3 on board wakeup push buttons for startup/shutdown operations.
HRST - Pressing it for 1 second reset the AT73C246 (when the AT73C246 in “ON”).
PWREN - Pressing it for 5 sec start/stop the AT73C246.
WAKEUP0 - Pressing it once enable the sequence in PMU_WAKEUP_EVENMENT register. On the
other hand, when the AT73C246 in “ON”, pressing it for 1 second switch the AT73C246 into standby
mode.
Programming
Jumper
Figure 2-12. Wakeup Push Buttons (SW2, SW3 and SW4)
2.10.5 LDOs Optional Programming Enable
Close J20 before any access to the state machine LDOs startup sequences.
HRST WAKEUP0PWREN

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