CDB5521 datasheet(19/28 Pages) CIRRUS

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DS317DB2

2.9 Calibration Window Overview

The following controls and indicators are associat-

ed with the Calibration Menu (Figure 9).

•

GAIN DECODE

Eight display boxes that displays the decoded

meaning of each gain register.

•

Gain Hexadecimal Icons

Eight input/display icons that allow a user to

set/clear the 24 bits in the eight gain registers

via 6 hexadecimal nibbles. If the upper nibbles

in the registers are zero’s, then leading zero

nibbles need to be entered.

•

Offset Hexadecimal Icons

Eight input/display icons that allow a user to

set/clear the 24 bits in the eight offset registers

via 6 hexadecimal nibbles. If the upper nibbles

in the registers are zero’s, then leading zero

nibbles need to be entered.

•

Self-Gain

Used to perform a self-gain calibration using

the chosen Setup.

•

Self-Offset

Used to perform a self-offset calibration using

the chosen Setup.

•

Shift Gain Register

Sixteen input icons used to shift the contents on

the gain registers either 1 bit left or right. Once

shifted the data at the respective gain registers

ends is lost.

•

System-Gain

Used to perform a system-gain calibration us-

ing the chosen Setup.

•

System-Offset

Used to perform a system-offset calibration us-

ing the chosen Setup.

•

Update Icons

This is a control icon. When pressed the offset

and gain registers are read. Then, the register

content icons are updated.

2.10 Trouble Shooting the Evaluation Board

This section describes special test modes incorporated

in the microcontroller software to diagnose hardware

problems with the evaluation board.

Note:

To enter these modes, set the test switches to the

appropriate position and reset the evaluation

board. To re-enter the normal operation mode, set

the switches back to binary zero and reset the

board again.

•

Test Mode 0, Normal Mode

This is the default mode of operation. To enter

this mode, set the test switches to 000 and reset

the board. The evaluation board allows normal

read/writes to the ADC’s registers. All the

LED’s toggle on then off after reset, and then

only when communicating with the PC.

•

Test Mode 1, Loop Back Test

This test mode checks the microcontroller’s on-

chip UART. To enter this mode, set test switch-

es to 001, set HDR7 for loop back, and then re-

set the board. If the communication works, all

the LED's toggle. Otherwise, only 1/2 of the

LED’s toggle to indicate a communication

problem.

•

Test Mode 2, Read/Write to ADC

This test mode tests the microcontroller’s abil-

ity to read and write to the ADC. To enter this

mode, set the switches to 010 and reset the

board. In this test mode, the ADC’s configura-

tion, offset, and gain registers are written to and

then read from. If the correct data is read back,

all the LED's toggle. Otherwise, only half of

them toggle to indicate an error.

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