CS5461

DS546F2

29

6.1.4 Power-Up/Halt

If the device is powered-down, this command will initiate a power on reset. If the part is already powered-on, all com-

putations will be halted.

6.1.5 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. Bringing the CS5461 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

6.1.6 Calibration

The device can perform a system AC offset calibration, DC offset calibration, AC gain calibration, and DC gain cal-

ibration. Offset and gain calibrations should NOT be performed at the same time (must do one after the other). Only

one gain calibration sequence should be performed for any given application. If calibration is needed, calibrate either

AC gain or DC gain, but not both. The user must supply the proper inputs to the device before initiating calibration.

V,I

Designates calibration channel

00 = Calibrate neither channel

01 = Calibrate the current channel

10 = Calibrate the voltage channel

11 = Calibrate voltage and current channel simultaneously

R

Designates calibration

0 = DC calibration

1 = AC calibration

G

Designates gain calibration

0 = No gain calibration

1 = Perform gain calibration

O*

Designates offset calibration

0 = No offset calibration

1 = Perform offset calibration

*If O is set then G is ignored.

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

110

V

I

R

G

O