CDB5461 datasheet(7/27 Pages) CIRRUS

Teilenummer	CDB5461

Bauteilbeschribung	Evaluation Board and Software

Download	27 Pages

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Hersteller	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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CDB5461

7

OPEN position for normal operation. When

testing the RS-232 link in the PC software,

close S1-3. The S1-2 switch selects the crystal

source for the 8051. There are two crystal op-

tions available, 11.059 MHz and 20 MHz. If

S1-2 is OPEN the 11.059 MHz crystal is se-

lected, and when S1-2 is CLOSED the 20 MHz

crystal is selected.

If S1-1 is closed, the CS5461 operates in

auto-

boot mode. When in auto-boot mode, a hard-

ware reset (press on S2) will cause the

CS5461 to boot up using the serial data from

the serial EEPROM on the board (U9). The

EEPROM must be programmed prior to the

auto-boot sequence. The EEPROM does

come pre-programmed with a valid boot-up

sequence.

This

sequence

programs

the

CS5461 for continuous conversion mode. If

voltage and current signals are applied to the

inputs, the CS5461 will issue pulses on the

/EOUT and /EDIR pins. The J24 header must

be shorted for auto-boot to work.

When the CDB5461 Evaluation Board is sent

from the factory, the EEPROM is programmed

with the following CS5461 command/data se-

quence:

40 00 00 61

;In configuration Register, turn

high- pass filters on, set K = 1.

4C 10 00 00

;Set Pulse Rate Register to

32768 Hz.

E8

;Start continuous conversions.

78 00 01 00

;Write stop bit to CS5461 to termi-

nate autoboot sequence

.

The auto-boot sequence runs with no assis-

tance from the 8051 microcontroller. The user

can verify this by disconnecting power from

the board, pulling the microcontroller out of its

socket, then power on again and run in auto-

boot mode. See the CS5461 data sheet for

more details on auto-boot.

2. SOFTWARE

The evaluation board comes with software and

RS-232 cable to link the evaluation board to

the PC. The evaluation software was devel-

oped with Lab Windows®/CVI®, a software de-

velopment

package

from

National

Instruments. The software was designed to

run under Windows®95 or later, and requires

about 3MB of hard drive space (2MB for the

CVI® Run-Time Engine, and 1MB for the eval-

uation software). After installing the software,

read the readme.txt file for any last minute up-

dates or changes. More sophisticated analysis

software can be developed by purchasing the

LabWindows® development package from Na-

tional Instruments.

8051 Mode

S1

8051 in Normal Operating Mode

S1-1 OPEN

S1-2 CLOSED 20 MHz Crystal

S1-3 OPEN

8051 in Normal Operation Mode

S1-1 OPEN

S1-2 OPEN 11.059 MHz Crystal

S1-3 OPEN

8051 in Test Mode

S1-1 OPEN

S1-2 CLOSED 20 MHz Crystal

S1-3 CLOSED

8051 in Test Mode

S1-1 OPEN

S1-2 OPEN 11.059 MHz Crystal

S1-3 CLOSED

Auto-Boot Mode

S1-1 CLOSED

S1-2 CLOSED

S1-3 OPEN

Table 4. DIP Switch S1 Setting

1

23

OPEN

1

23

OPEN

1

23

OPEN

1

23

OPEN

1

23

OPEN

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