CS5550

16

DS630F1

4.1.4 Power-Up/Halt

If the device is powered-down, this command will power-up the device. When powered-on, no computations will be

running. If the part is already powered-on, all computations will be halted.

4.1.5 Power-Down and Software Reset

The device has two power-down states to conserve power. If the chip is put in stand-by state, all circuitry except the

analog/digital clock generators is turned off. In the sleep state, all circuitry except the digital clock generator and the

instruction decoder is turned off. Waking up the CS5550 out of sleep state requires more time than out of stand-by

state, because of the extra time needed to re-start and re-stabilize the analog clock signal.

S1,S0

Power-down state

00 = Software Reset

01 = Halt and enter stand-by power saving state. This state allows quick power-on time

10 = Halt and enter sleep power saving state. This state requires a slow power-on time

11 = Reserved

4.1.6 Calibration

The device has the capability of performing a system offset calibration and gain calibration. Offset and gain calibra-

tions should NOT be performed at the same time (must do one after the other). Proper inputs must be supplied to

the device before initiating calibration.

A2,A1

Designates calibration channel

00 = Not allowed

01 = Calibrate the AIN1 channel

10 = Calibrate the AIN2 channel

11 = Calibrate AIN1 channel and AIN2 channel simultaneously

G

Designates gain calibration

0 = Normal operation

1 = Perform gain calibration

O

Designates offset calibration

0 = Normal operation

1 = Perform offset calibration

B7

B6

B5

B4

B3

B2

B1

B0

10100000

B7

B6

B5

B4

B3

B2

B1

B0

100

S1

S0

000

B7

B6

B5

B4

B3

B2

B1

B0

1

1

0

A2

A1

0

G

O