AD5748

Rev. A | Page 10 of 32

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

PIN 1

INDICATOR

TOP VIEW

(Not to Scale)

AD5748

1

SDO/VFAULT

2

CLRSEL

3

CLEAR

4

DVCC

5

GND

6

SYNC/RSET

7

SCLK/OUTEN

8

SDIN/R0

24 VSENSE+

23 VOUT

22 VSENSE–

21 AVSS

20 COMP1

19 COMP2

18 IOUT

17 AVDD

NOTES

1. NC = NO CONNECT.

2. THE EXPOSED PADDLE IS TIED TO AVSS.

Figure 4. Pin Configuration

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

SDO/VFAULT

Serial Data Output (SDO). In software mode, this pin is used to clock data from the input shift register in

readback mode. Data is clocked out on the rising edge of SCLK and is valid on the falling edge of SCLK.

This pin is a CMOS output.

Short-Circuit Fault Alert (VFAULT). In hardware mode, this pin acts as a short-circuit fault alert pin and is

asserted low when a short-circuit error is detected. This pin is an open-drain output and must be connected

to a pull-up resistor.

2

CLRSEL

In hardware or software mode, this pin selects the clear value, either zero-scale or midscale code. In software

mode, this pin is implemented as a logic OR with the internal CLRSEL bit.

3

CLEAR

Active High Input. Asserting this pin sets the output current/voltage to zero-scale code or midscale code of the

range selected (user-selectable). CLEAR is a logic OR with the internal clear bit.

In software mode, during power-up, the CLEAR pin level determines the power-on condition of the voltage

channel, which can be active 0 V or tristate. See the Asynchronous Clear (CLEAR) section for more details.

4

DVCC

Digital Power Supply.

5

GND

Ground Connection.

6

SYNC/RSET

Positive Edge-Sensitive Latch (SYNC). In software mode, a rising edge parallel loads the input shift register data

into the AD5748, also updating the output.

Resistor Select (RSET). In hardware mode, this pin chooses whether the internal or the external current sense

resistor is used.

If RSET = 0, the external sense resistor is chosen.

If RSET = 1, the internal sense resistor is chosen.

7

SCLK/OUTEN

Serial Clock Input (SCLK). In software mode, data is clocked into the input shift register on the falling edge of

SCLK. This pin operates at clock speeds of up to 50 MHz.

Output Enable (OUTEN). In hardware mode, this pin acts as an output enable pin.

8

SDIN/R0

Serial Data Input (SDIN). In software mode, data must be valid on the falling edge of SCLK.

Range Decode Bit (R0). In hardware mode, this pin, in conjunction with R1, R2, and R3, selects the output

current/voltage range setting on the part.

9

AD2/R1

Device Addressing Bit (AD2). In software mode, this pin, in conjunction with AD1 and AD0, allows up to eight

devices to be addressed on one bus.

Range Decode Bit (R1). In hardware mode, this pin, in conjunction with R0, R2, and R3, selects the output

current/voltage range setting on the part.

10

AD1/R2

Device Addressing Bit (AD1). In software mode, this pin, in conjunction with AD2 and AD0 allows up to eight

devices to be addressed on one bus.

Range Decode Bit (R2). In hardware mode, this pin, in conjunction with R0, R1, and R3, selects the output

current/voltage range setting on the part.