as1720 austriamicrosystems, as1720 Datasheet - Page 2

• Manufacturer Part Number: as1720
• Description: Solenoid / Valve Driver With Current Limitation
• Manufacturer: austriamicrosystems

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
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Table 2. Pin Descriptions
Pin Name
VDDHV
VDDA
DUTY
OUT
VSS
ENN
IE
IH
Pin Number
1
2
3
4
5
6
7
8
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 V
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 powerd 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 powerd 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.
VDDHV
VDDA
DUTY
OUT
2
4
1
3
AS1720
Revision 1.03
8 ENN
7 IH
6 IE
5 VSS
Description
DDA
the 50% duty cycle is selected
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