XRP77XXEVB-XCM - Exar - Datasheet.Live

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October 2013 Rev. 1.3.

1

Exar Corporation www.exar.com

48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 – Fax. +1 510 668-7001

GENERAL DESCRIPTION

The XRP77XXEVB-XCM (Exar Configuration

Module) is a board that is designed to assist in

the customer in the programming and bring-

up of PowerXR Digital PWM controllers on a

customer board. The XCM has a USB

connection on the one side for connection to a

PC and control through PowerArchitectTM

software. On the right opposite side of the

XCM is a 10-pin connector which is used to

connect to the user’s system board in order to

communicate to any of the supported PowerXR

ICs.

The XCM includes a uC with on-board flash so

that when powered from the system board, it

can act as a boot loader to the PowerXR

controller.

This board is compatible with the; XRP7704,

XRP7708, XRP7740, XRP7713, and XRP7714.

UPDATE – XRP7724 enabled boards with

updated firmware. See “Compatibility”, “Using

I2C Communication” and “Pass Through Mode”

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FEATURES

• USB to I2C Communication for PowerXR

Devices

• Boot Loader Functionality

− Avoids programming the NVM until final

configuration known

• Powered by USB or System Board

• Enables Rapid Prototyping

EVALUATION BOARD SCHEMATICS

Figure 1: XRP77XXEVB-XCM Evaluation Board Schematics

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PIN ASSIGNMENT

Figure 2: XRP77XXEVB-XCM JP4 Pin Assignment

PIN DESCRIPTION

Name Pin Number Description

SCL

JP4 PIN1 I2C Clock

GND JP4 PIN2 Ground

SDA JP4 PIN3 I2C Data

Reserved JP4 PIN4

I2C Power JP4 PIN5 Connect to the preferred IO voltage. Only required when a voltage other than 3.3V is

desired.

Reserved

JP4 PIN6

GND

JP4 PIN7 Ground

GND JP4 PIN8 Ground

ENABLE JP4 PIN9 Connects to the EN pin of the XRP77XX. This is an input to the XCM board.

VIN JP4 PIN10 Can connect to voltages from 4.5V to 30V

ORDERING INFORMATION

Part Number Description

XRP77XXEVB-XCM Exar Configuration Module

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USING THE EVALUATION BOARD

OPERATING ASSUMPTIONS

The following are the basic assumptions for

the operation of the XCM.

• Only one I2C Master is active at any time on

the customer board. The user must ensure

that only 1 master is active on the I2C lines

at the same time. This could entail Host in

Reset, Host communication lines disabled,

etc.

• The user must connect the appropriate

signals to from the system board to the

XCM JP4. At a minimum; SDA, SCL, and

GND must be connected.

• VIN and ENABLE must also be connected, if

the customer wants the XCM board to

operate in “Standalone Mode”.

Using I2C Communication

The XCM has an on board linear regulator to

provide power to the uC and provides power

to the I2C lines. The internal pull-up resistors

are 4.7kohm. By changing the position of the

jumpers on JP2 and JP3, the pull-up resistors

can be connected to either the 3.3V provided

on the XCM or to the I2C Power connected to

JP4 Pin 5. In Figure 2 the jumpers are

configured to use the on board 3.3V. Moving

them to the other position connects the pull-

up resistors to the external I2C Power.

IMPORTANT: When using the XCM with

XRP7713EVB or XRP7714EVB demo boards,

the jumpers should be configured to use the

3.3V provided on the XCM. When using with

the XRP7724EVB board, the jumpers should

be moved to the other position to use the

pull-up resistors already installed on the

XRP7724EVB.

If the system board already has pull-up

resistors, then the jumpers can simply be

removed. This is the most likely scenario for

a system intended to interact with the

programmable features of the PowerXR device

on the system board.

COMMUNICATION WITH THE XCM

If the XCM is connected to the PC before

starting the PowerArchitectTM software, the

software should recognize the presence of the

board automatically. If the board is connected

after the software is started, the user will need

to click on “File”, then “Board Search” for the

software to find the board.

Once the board is identified, the software will

add a tab called “XCM” as shown in Figure 3.

Figure 3: PowerArchitectTM XCM Tab

LED INDICATORS:

There are 6 LEDs on the board.

There are four LEDs grouped in the upper left

hand corner of the board as shown in Figure 3.

These are defined as:

DS3: USB Operation

GUI is communicating to XCM (solid on when

USB is connected)

DS4: Reconfig Mode

The XCM will boot load the supported device

with the stored configuration the ENABLE pin

transitions from Low to High.

DS1: USB Activity

Flashes based upon the USB activity between

the XCM and the PC.

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Figure 4: XCM LED Indicators

DS5: I2C Activity

Flashes based upon the I2C activity between

the XCM and the XRP77XX.

DS3: USB Power

There is a fifth LED just to the right of the USB

connector, which will be on permanently as

long as USB power is applied to the XCM.

DS6: 3.3V Power

The sixth LED is in the upper right hand

corner. This indicates the LDO is generating

3.3V and the uC is powered.

OPERATING THE XCM

Here are the two basic operating modes of the

XCM.

• Pass Through Mode: The XCM is getting its

power from the USB, and the

PowerArchitectTM GUI is operational. In this

mode, the “USB Operating” LED DS3 will be

on.

• Standalone Mode: The XCM is getting its

power from VIN of the Customer Board; the

GUI is not operational. In this mode, the

XCM acts as a boot loader to the supported

device.

PASS THROUGH MODE

When in USB Mode, the XCM supports pass-

thru mode from the PC running

PowerArchitectTM to the supported device on

the designer’s system board. This operation

allows writes/reads to either the shadow

registers or Non-Volatile Memory of the

supported device

• XCM receives commands from the GUI

(over USB), and translates them via I2C if

the ENABLE pin is logic HIGH.

• The GUI has the option to write a given

configuration to NVM or Shadow Registers

of the supported device.

• XCM also supports reads from the

supported device shadow and NVM registers

for display in PowerArchitectTM.

STANDALONE MODE

UPDATE: Since the XRP7724 is Flash memory

based, this mode is not required nor supported

for the XRP7724.

The XCM allows the GUI to save a

configuration into Flash on the XCM. In order

to enable the boot loader functionality, the

“Reconfig Mode” box must be checked. When

there is a stored configuration on the XCM

flash, the GUI will indicate the presence of

that information in the “Graphic of Bytes” box.

To store a configuration to the XCM, click the

“Same to Module” button.

Figure 5: XCM Loaded for Standalone Mode

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Note that only one configuration can be stored

in the XCM. When storing the configuration

onto the XCM, a “Success” window will pop up.

After clicking “OK” there can be a noticeable

delay in the software.

Powering the XCM

In order to operate, the XCM must have power

provided either by connecting the VIN pin on

JP4 to a power source from the system board

or from USB power.

The XCM’s on board linear regulator has a

maximum input voltage of 30V, so whatever

voltage source is powering the PowerXR device

on the system board can be connected to the

XCM.

Downloading the Configuration

The XCM will download the configuration

stored on the XCM FLASH memory on every

reset of the supported device. It does by

monitoring the ENABLE Pin for a LOW to HIGH

transition.

The XCM automatically downloads the saved

Flash configuration into the supported device

shadow registers via I2C. The register data is

loaded in a specific order to prevent mis-

operation of the supported device. The XCM

first configures Fault Ignore settings,

downloads channel information, and finally

configures the channel and GPIO enables.

One could imagine the result, if the channel

was enabled before the control loop PID

coefficients were loaded.

NVM Programming

When in Standalone Mode, the primary

intention for the XCM is to act as a boot loader

into the shadow RAM. However, by installing

a jumper between pins 2-4 on JP1, the XCM

will program the NVM. There are no

diagnostics in this mode. If a device’s NVM

has already been programmed, it cannot be

re-programmed. If a changed configuration is

attempted to be programmed into a previously

programmed part, erroneous behavior is

highly likely. The reason for including this

function is for the developer who has

concluded their evaluation and wishes to

quickly program the NVM of the PowerXR

device on additional systems.

WHEN THINGS DO NOT WORK

The following are potential issues that may

cause improper or no operation.

• SCL, SDA, or GND are swapped.

• Check that the I2C pull-up resister jumpers

on JP2 and JP3 are in place. Or correctly

configured for your system.

• If you made your own ribbon cable with a

10 pin connector and accidentally attach it

reversed, you just tied VIN to SCL and

damaged the uC. Time for a new XCM.

• You are using 2 foot long wires hanging

loose creating an inductive loop which is

blocking the I2C communication. Twisting

them together should reduce the

inductance.

• You can communicate to the part when it is

not operating, but when you turn on the

switching channels, communication stops.

This is difficult to fix because the most

likely cause is ground bounce caused by

poor grounding practices. See ANP-32,

“Practical Layout Guidelines for PowerXR

Designs”

• Another possibility if communication is not

working is a long ground loop causing

noise. One could put an isolator on the I2C

line, but using a notebook computer with

the power adapter disconnected works as

well.

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COMPATIBILITY

With the release of the XRP7724 the firmware

of the XCM has been updated. This has

resulted in a compatibility issue when being

used with PowerArchitectTM 4.21 and earlier

revisions. XCMs which have updated firmware

will be labeled “V62”. If this XCM is first

powered by the USB cable and discovered by

PowerArchitectTM 4.21, the demo panel may

show erroneous information (see Figure 7).

However, if the XRP7704/08/40 or XRP7713/4

is first connected to the XCM then powered

before connecting the USB cable, normal

operation will occur. Future versions of

PowerArchitectTM 4.xx will eliminate this

compatibility issue.

Figure 7 PowerArchitectTM 4.21 Demo Tab when XRP7724 configured XCM not powered in proper sequence

Figure 6 XCM with updated firmware

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COMPATIBILITY WITH SYSTEMS THAT PULL I2C LINES UP ON THE MAIN BOARD

In systems where I2C lines are pulled up on main board (not on XCM through JP2/3; JP2/3 open)

the pull-up level will sag under heavy communication load on the bus. Although we have not seen

issues with this arrangement, it would be possible to have communication problems especially if

serial resistors were used on SDA and SCL lines. To eliminate the issue users have a couple of

options:

• Remove pull-up resistors on their board and use 3.3V pull-up option on XCM (shorting pins 2 and 3 on

JP2/3)

• If the pull up rail used to pull I2C lines up on the user’s board is routed to JP4 pin 5 (signal name

I2C_POWER) of XCM, this voltage can be used to pull the lines up on XCM (shorting pins 1 and 2 on

JP2/3). The pull-up resistors on user’s board shall be removed in this case.

• If using pull-up resistors on user’s board is the only option, capacitors C6 and C13 on XCM shall be

removed and JP2/JP3 shall be open (no jumpers installed).

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EVALUATION BOARD SCHEMATICS

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BILL OF MATERIAL

Ref. Qty Manufacturer Part Number Size Component

1

PCB REV2.0

U1 1

Silicon Laboratories

C8051F320-GQ

LQFP-32

IC 8051 MCU 16K FLASH 32LQFP

U2 1

EXAR

SPX2954M3-L-3-3

SOT-223

IC REG LDO 3.3V SOT-223

D1, D2 2

Fairchild

MBR0530T1

SOD-323

DIODE SCHOTTKY 500mA 30V

DS2, DS6 2

Wurth Elektronik

150120EAS75000

1206p

LED AMBER SMD

DS1, DS3,

DS4, DS5 4

Wurth Elektronik

150120EVS75000

1206p

LED GREEN SMD

C1, C6, C7,

C9, C10, C13 6

MURATA

GRM188R71H104K

0603

Cap, .1UF, 50V, X7R, 10%, 0603 SMD

C2, C5, C11 3 MURATA

GRM21BR71C475KA73

0805

C_Chip_4.7uF_16V_X7R_0805 SMD

C8 1

Vishay

293D106X9010B2TE3

B TANT CAP

Cap, Tantalum 10uF 10V, CASE B

C12 1

MURATA

GRM21BR71H105KA12L

0805

Cap, Ceramic, 1uF 50V, X7R, 10% 0805

R1, R2 2

PANASONIC

ERJ-3EKF22R0V

0603

Res 22 OHM 1% 0603 SMD

R3 1 ROHM MCR03EZPFX1002 0603 RES 10K 1/10W 1% 0603

R6 1

PANASONIC

ERJ-3GEY0R00V

0603

Res 0 OHM 0603 SMD

R7 1

PANASONIC

ERJ-6ENF1001V

0805

RES 1K OHM 1/8W 5% 0805 SMD

R10 1

PANASONIC

ERJ-6GEYJ302V

0805

RES 3K OHM 1/8W 5% 0805 SMD

R11, R12,

R14, R15 4

PANASONIC

ERJ-6GEYJ471V

0805

RES 470 OHM 1/8W 5% 0805

R8, R20 2

PANASONIC

ERJ-3EKF4701V

0603

RES 4.7K OHM 1/10W 1% 0603 SMD

R18 1 PANASONIC ERJ-6GEY0R00V 0805 Res 0 OHM 0805 SMD

R13, R16, R17

3

PANASONIC

ERJ-3EKF2701V

0603

RES 2.7K OHM 1/10W 1% 0603 SMD

KB1 1

PANASONIC

ERJ-8GEY0R00V

1206

Res 0 OHM 1206 SMD

J1 1

Wurth Elektronik

65100516121

USB_B_mini

CONN RECEPT MINIUSB R/A 5POS SMD

JP1, JP4 2

Wurth Elektronik

61308021121

HDR2X5

CONN Header 5x2, 0.1 inch

JP2, JP3 2 Wurth Elektronik

61304011121

HDR1X3

CONN HEADER 3POS 0.1 VERT GOLD

T9, T10, T11,

T12 4

TEST POINT

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EVALUATION BOARD LAYOUT

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DOCUMENT REVISION HISTORY

Revision Date Description

1.0.0 04/28/2011 Initial release of document

1.2.0 10/01/2012 Added information on XRP7724 compatible XCM boards. See jumper settings and

compatibility with PowerArchitectTM 4.21 or earlier.

1.3.0 01/28/2013 Added a note for using the module in systems where I2C pull-ups are on the other

board and JP2/3 are open on the XCM module

1.3.1 10/14/2013 Updated the bill of materials section

BOARD REVISION HISTORY

Board Revision

Date Description

2.0 Dec 2009 Initial release of evaluation board

FOR FURTHER ASSISTANCE

Email: powertechsupport@exar.com

customersupport@exar.com

Exar Technical Documentation: http://www.exar.com/TechDoc/default.aspx?

EXAR CORPORATION

HEADQUARTERS AND SALES OFFICES

48720 Kato Road

Fremont, CA 94538 – USA

Tel.: +1 (510) 668-7000

Fax: +1 (510) 668-7030

www.exar.com

NOTICE

EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve

design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein,

conveys no license under any patent or other right, and makes no representation that the circuits are free of patent

infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a

user’s specific application. While the information in this publication has been carefully checked; no responsibility, however,

is assumed for inaccuracies.

EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or

malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its

safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in

writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all

such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.

Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.

Mouser Electronics

Authorized Distributor

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XRP77XXEVB-XCM