AS2702-16T データシートの表示（PDF） - austriamicrosystems AG
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AS2702-16T Datasheet PDF : 13 Pages
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AS2702 – AS-Interface Slave IC
Operation Status Pins LED1 and LED2
Pins LED1 and LED2 are both equipped with a low-side open-drain output switch plus a passive high-side current source with a
nom. 10µA pull-up current capability. They will each have an LED load connected to UOUT, which will flag the operation status of
the slave device, according to the following table:
Output LED1
Output LED2
Flagging Priority
Slave Device
Reason
(green LED
(red LED
(1 = highest, …,
Operation Status
connected)
connected)
4 = lowest)
off
off
Supply voltage off
No supply voltage
on
off
Regular operation
off
of
4
No data communication Regular, non-zero slave address
coded; data comm. watchdog
triggered
blinks
on
3
No regular slave address Slave address = default zero
coded
blinks
blinks (alternating
2
Hardware failure in
Input PFAULT = L
with LED1)
sensor/actuator circuitry
off
blinks
1
External RESET or
DSTBn = L to RESET, or UOUT
overload at UOUT pin
switched-off due to overload
(LED1 and LED2 both also feature an input stage, to simplify component test and shorten test time of the slave device.)
The dc- and timing parameters of pins LED1 and LED2 are specified as follows:
Symbol Parameter
Min
ILED
Sink current @ output L
10
IOUTHI Leakage current @ output off
-10
VIN
Acceptable input voltage @ output off
-0.3
fBLINK
Blinking frequency
2
Max Unit Note
mA VOUT = 1V
10 µA VOUT = 5V
40
V
3
Hz
Data Communication Watchdog
AS2702 is equipped with a watchdog timer to supervise data communication by monitoring the strobe signals at pins DSTBn and
PSTBn.
If a parameter or data strobe is not followed by a consecutive strobe within a time period of 50 … 100ms, the watchdog is triggered
and initiates a ‘soft’ reset, see section Reset.
Reset
There are 2 categories of reset-events, leading to 2 slightly different reset-conditions of the slave device:
1 A ‘hard’ reset taking place at power-up and power-down of supply-voltages U5R and UOUT.
At power-up the slave device leaves reset-condition as soon as U5R has passed 3.75V and UOUT has passed VCOMOFF =
nom. 10V.
At power-down the slave device is forced into reset-condition as soon as U5R drops below 3.75V.
(Tolerance of the threshold voltages referred to is ±5 %)
2 A ‘soft’ reset, resulting from one of the following events:
2.1 Data strobe pin DSTBn is kept L for more than 100ms;
2.2 Master command ‘RESET SLAVE’ is received;
2.3 Master command ‘RESET BROADCAST’ is received;
2.4 The communication watchdog is triggered.
Revision 1.3, 21-Aug-08
Page 10 of 13
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