AS1720A-ATDT 查看數據表（PDF） - austriamicrosystems AG

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AS1720A-ATDT

Solenoid / Valve Driver with Current Limitation

austriamicrosystems AG 

AS1720

Datasheet - Pin Assignments

4 Pin Assignments

Figure 2. Pin Out (Top View)

VDDHV 1

8 ENN

VDDA 2

7 IH

AS1720

DUTY 3

6 IE

OUT 4

5 VSS

Pin Description

Table 2. Pin Descriptions

Pin Name

Pin Number

VDDHV

1

VDDA

2

DUTY

3

OUT

4

VSS

5

IE

6

IH

7

ENN

8

Description

Positive supply voltage

Internal supply of 3.3V (typ.)

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

pin to VDDA the 50% duty cycle is selected automatically.

Current Source Output

Ground

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

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

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

www.austriamicrosystems.com/Solenoid-Relay-Driver/AS1720 Revision 1.04

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