EVAL-AD5382EB【PDF 23/40 页】32-Channel, 3 V/5 V, Single-Supply, 14-B

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AD5382

Table 16. Control Register Contents

MSB

CR13

CR12

Control Register Write/Read

REG1 = REG0 = 0, A4–A0 = 01100, R/W status determines if

the operation is a write (R/W = 0) or a read (R/W = 1). DB13 to

DB0 contains the control register data.

Rev. 0 | Page 23 of 40

CR11

CR10

CR9

CR8

CR7

CR6

CR5

CR4

CR3

CR2

CR1

LSB

CR0

Control Register Contents

CR13:

Power-Down Status. This bit is used to configure the

output amplifier state in power down.

CR13 = 1. Amplifier output is high impedance (default on

power-up).

CR13 = 0. Amplifier output is 100 k to ground.

CR12:

REF Select. This bit selects the operating internal

reference for the AD5382. CR12 is programmed as follows:

CR12 = 1: Internal reference is 2.5 V (AD5382-5 default), the

recommended operating reference for AD5382-5.

CR12 = 0: Internal reference is 1.25 V (AD5382-3 default),

the recommended operating reference for AD5382-3.

CR11:

Current Boost Control. This bit is used to boost the

current in the output amplifier, thereby altering its slew rate.

This bit is configured as follows:

CR11 = 1: Boost Mode On. This maximizes the bias current

in the output amplifier, optimizing its slew rate but increasing

the power dissipation.

CR11 = 0: Boost Mode Off (default on power-up). This

reduces the bias current in the output amplifier and reduces

the overall power consumption.

CR10:

Internal/External Reference. This bit determines if the

DAC uses its internal reference or an externally applied

reference.

CR10 = 1: Internal Reference Enabled. The reference output

depends on data loaded to CR12.

CR10 = 0: External Reference Selected (default on power up).

CR9:

Channel Monitor Enable (see Channel Monitor Function)

CR9 = 1: Monitor Enabled. This enables the channel monitor

function. After a write to the monitor channel in the SFR

MON_OUT pin.

CR9 = 0: Monitor Disabled (default on power-up). When the

monitor is disabled, MON_OUT is three-stated.

CR8:

Thermal Monitor Function. This function is used to

monitor the AD5382’s internal die temperature when enabled.

The thermal monitor powers down the output amplifiers when

the temperature exceeds 130°C. This function can be used to

protect the device in cases where power dissipation may be

exceeded if a number of output channels are simultaneously

short-circuited. A soft power-up will re-enable the output

amplifiers if the die temperature has dropped below 130°C.

CR8 = 1: Thermal Monitor Enabled.

CR8 = 0: Thermal Monitor Disabled (default on power- up).

CR7 and CR6:

Don’t Care.

CR5 to CR2:

Toggle Function Enable. This function allows the

user to toggle the output between two codes loaded to the A and

B register for each DAC. Control register bits CR5 to CR2 are

used to enable individual groups of eight channels for opera-

tion in toggle mode. A Logic 1 written to any bit enables a group

of channels; a Logic 0 disables a group. LDAC is used to toggle

between the two registers. Table 17 shows the decoding for

toggle mode operation. For example, CR5 controls group 3,

which contains channels 24 to 31, CR5 = 1 enables these

channels .

CR1 and CR0:

Don’t Care.

Table 17.

CR Bit

CR5

CR4

CR3

CR2

Channel Monitor Function

REG1 = REG0 = 0, A4–A0 = 01010

Group

Channels

24–31

16–23

8–15

0–7

DB13–DB8 = Contain data to address the monitored channel.

A channel monitor function is provided on the AD5382. This

feature, which consists of a multiplexer addressed via the

interface, allows any channel output or the signals connected to

the MON_IN inputs to be routed to the MON_OUT pin for

monitoring using an external ADC. The channel monitor

function must be enabled in the control register before any

channels are routed to MON_OUT. On the AD5382, DB13 to

DB8 contain the channel address for the monitored channel.

Selecting channel address 63 three-states MON_OUT.

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