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AS1720

Datasheet - P i n A s s i g n m e n t s

4 Pin Assignments

Figure 2. Pin Out (Top View)

Pin Description

Table 2. Pin Descriptions

Pin Name

Pin Number

Description

VDDHV

1

Positive supply voltage

VDDA

2

Internal supply of 3.3V (typ.)

DUTY

3

Duty-Cycle. By means of this pin the duty cycle can be adjusted between 20% and 90% during hold

phase. The duty cycle can be adjusted by a voltage source or an external resistor divider. Setting this

OUT

4

Current Source Output

VSS

5

Ground

IE

6

Energize Current. This pin defines the current during energize phase by means of a resistor.

IH

7

Hold Current. This pin defines the current during hold phase by means of a resistor.

ENN

8

Enable Not. This pin can be used to switch on/off the current source (e.g. via a P), when the

AS1720 is always powered on.

Low during start-up: When VDDHV is applied, the device starts with the energise phase, followed by

the hold phase.

When the device is constantly powered on, it can be controlled by this pin.

High: The output current source is switched off.

Low: The device starts with the energise phase, followed by the hold phase.

1

VDDHV

AS1720

2

VDDA

3

DUTY

4

OUT

8 ENN

7 IH

6 IE

5 VSS