CDB5521 datasheet(9/28 Pages) CIRRUS

9 / 28 page

CDB5521/22/23/24/28

DS317DB2

1.6 Software

The evaluation board comes with software and an

RS-232 cable to link the evaluation board to the

PC. The executable software was developed with

Lab Windows/CVITM and meant to run under Win-

dowsTM 3.1 or later. After installing the software,

read the readme.txt file for last minute changes in

the software. Additionally, Section 2., Part II: Soft-

ware further details how to install and use the soft-

ware

1.7.

Writing Your Own Interface Software

Tables 2 through 5 list the RS-232 commands used

to communicate between the PC and the microcon-

troller. To develop additional code to communi-

cate to the evaluation board via RS-232, the

following applies: to write to an internal ADC reg-

ister, choose the appropriate write command byte

(See Table 2), and transmit it LSB first. Then,

transmit the three data bytes lowest order byte (bits

7-0) first with the LSB of each byte transmitted

first. These three data bytes provide the 24-bits of

information to be written to the desired register.

To read from an internal register, choose the appro-

priate read command byte and transmit it LSB first.

Then, the microcontroller automatically acquires the

ADC’s register contents and returns the 24-bits of

information. The returned data is transmitted lowest

order byte first with the LSB of each byte transmit-

ted first.

Name

Function Description

HDR1

Used to switch AIN1+ (AIN1 on

CS5528) between J1 and AGND.

HDR2

Used to switch AIN1- (AIN2 on

CS5528) between J1 and AGND.

HDR3

Does not exist.

HDR4

Used to switch the power for NBV

from the LM337, CPD, or AGND.

HDR5

Used to switch VREF+ and VREF-

pins from external J2 header to the on

board LT1019 reference.

HDR6

Used to connect an external micro-

controller.

HDR7

Used in conjunction with the self test

modes to test the UART/RS232 com-

munication link between the micro-

controller and a PC.

HDR8

Used to switch AIN2 + (AIN3 on

CS5528) between J1 and AGND.

HDR9

Used to switch AIN2- (AIN4 on

CS5528) between J1 and AGND.

HDR10

Does not exist.

HDR11

Used to switch AIN3+ (AIN5 on

CS5528) between J1 and AGND.

HDR12

Used to switch AIN3- (AIN6 on

CS5528) between J1 and AGND.

HDR13

Used to switch AIN4+ (AIN7 on

CS5528) between J1 and AGND.

HDR14

Used to switch AIN4- (AIN8 on

CS5528) between J1 and AGND.

Table 1. Header Descriptions

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