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ADuC7060

Excitation Current Sources Control Register

Name:

Address:

Default value:

Access:

Function:

IEXCON

0xFFFF0570

0x00

Read and write

This 8-bit MMR controls the two excitation current sources, IEXC0 and IEXC1.

Table 60. IEXCON MMR Bit Designations

Bits

7

6

5

4

3:1

0

Name

IEXC1_EN

IEXC0_EN

IEXC1_DIR

IEXC0_DIR

IOUT[3:1]

IOUT[0]

Description

Enable bit for IEXC1 current source.

Set this bit = 1 to enable Excitation Current Source 1.

Clear this bit to disable Excitation Current Source 1.

Enable bit for IEXC0 current source.

Set this bit = 1 to enable Excitation Current Source 0.

Clear this bit to disable Excitation Current Source 0.

Set this bit = 1 to direct Excitation Current Source 1 to the IEXC0 pin.

Set this bit = 0 to direct Excitation Current Source 1 to the IEXC1 pin.

Set this bit = 1 to direct Excitation Current Source 0 to the IEXC1 pin.

Set this bit = 0 to direct Excitation Current Source 0 to the IEXC0 pin.

These bits control the excitation current level for each source.

IOUT[3:1] = 000, excitation current = 0 μA + (IOUT[0] × 10 μA).

IOUT[3:1] = 001, excitation current = 200 μA + (IOUT[0] × 10 μA).

IOUT[3:1] = 010, excitation current = 400 μA+ (IOUT[0] × 10 μA).

IOUT[3:1] = 011, excitation current = 600 μA+ (IOUT[0] × 10 μA).

IOUT[3:1] = 100, excitation current = 800 μA+ (IOUT[0] × 10 μA).

IOUT[3:1] = 101, excitation current = 1 mA + (IOUT[0] × 10 μA).

All other values are undefined.

Set this bit = 1 to enable 10 μA diagnostic current source.

Clear this bit = 0 to disable 10 μA diagnostic current source.

EXAMPLE APPLICATION CIRCUITS

Figure 17 shows a simple bridge sensor interface to the ADuC7060,

including the RC filters on the analog input channels. Notice

that the sense lines from the bridge (connecting to the reference

inputs) are wired separately from the excitation lines (going to

DVDD/AVDD and ground). This results in a total of six wires

going to the bridge. This 6-wire connection scheme is a feature

of most off-the-shelf bridge transducers (such as load cells) that

helps to minimize errors that would otherwise result from wire

impedances.

In Figure 18, AD592 is an external temperature sensor used to

measure the thermocouple cold junction, and its output is con-

nected to the auxiliary channel. ADR280 is an external 1.2 V

reference part—alternatively, the internal reference can be used.

Here, the thermocouple is connected to the primary ADC as

a differential input to ADC0/ADC1. Note the resistor between

VREF+ and ADC1 to bias the ADC inputs above 100 mV.

Figure 19 shows a simple 4-wire RTD interface circuit. As with

the bridge transducer implementation in Figure 17, if a power

supply and a serial connection to the outside world are added,

then Figure 19 represents a complete system.

Rev. 0 | Page 49 of 100

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