A2SI-SR datasheet, PDF - EEWORLD Datasheet

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A2SI-SR: DescriptionInterface Circuit, CMOS, PDSO28, 5.30 MM, SSOP-28; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size408KB，31 Pages; ManufacturerZentrum Mikroelektronik Dresden AG (IDT)

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A2SI-SR Overview

Interface Circuit, CMOS, PDSO28, 5.30 MM, SSOP-28

A2SI-SR Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	Zentrum Mikroelektronik Dresden AG (IDT)
Parts packaging code	SSOP
package instruction	SSOP,
Contacts	28
Reach Compliance Code	compliant
Interface integrated circuit type	INTERFACE CIRCUIT
JESD-30 code	R-PDSO-G28
JESD-609 code	e0
length	10.2 mm
Humidity sensitivity level	3
Number of functions	1
Number of terminals	28
Maximum operating temperature	85 °C
Minimum operating temperature	-25 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	240
Certification status	Not Qualified
Maximum seat height	2 mm
Maximum supply voltage	33.1 V
Minimum supply voltage	16 V
surface mount	YES
technology	CMOS
Temperature level	OTHER
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
width	5.3 mm

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A²SI

Advanced AS-Interface IC

Features

AS-i Complete Specification V2.11 compliant

Integrated EEPROM

Additional addressing channel using an opto-electronic interface

Extended address mode operation as programmable option (up to 62 slaves)

High impedance AS-i line input, additional pins for further impedance optimizations

DC voltage output, approximately 24 volts, not stabilized

5 volt DC voltage output, stabilized, CMOS logic can be supplied directly (e.g. µC)

LED status indicator output (compliant with the standard indication recommendation)

Integrated watchdog

Description

A²SI is a monolithic CMOS integrated circuit certified for AS-i (Actuator Sensor-interface) networks. AS-i

networks are intended for industrial automation.

The main advantage of AS-i solutions is that actuators and sensors are connected using a two-wire unshielded

cable that is easy to install. This cable transports both power and information/data.

AS-i network communication is based on the master-slave principle. The network can be extended (to cable

lengths greater than 100m) by using the A²SI in the repeater mode configuration.

AS-i is a standard for the automation industry based on IEC 62026-2 and EN 50295.

The device is available in a 28-pin SSOP package.

Block Diagram

2.2

24V

OUT

U5R

8 MHz

U5RD

OSC1/2

CAP

POWERFAIL

DETECTION

ELECTRONIC

INDUCTOR

POWER

SUPPLY

OSCILLATOR

RECEIVE

DOx

DIx

DSR

PST

TRANSMIT

ASI+

ASIP

DIGITAL

LOGIC

ASI–

ASIN

THERMAL

PROTECTION

GND2

GND1

IRD

AMP

GND

IRD

LED

FID

Figure 1: Block Diagram

Data Sheet, Rev. 2.4, March 04, 2002

1/31

A²SI

Advanced AS-Interface IC

6.3

Transmitter

The transmitter draws a modulated current between ASIP and ASIN pins to generate the communication

signals. The shape of the current corresponds to the integral of a sin2-function. The transmitter uses a current

DAC and a high current driver. In order to activate high current drive capability, a small current will be turned on

automatically prior to each transmission (slave mode only). The current will be ramped up slowly to avoid false

voltage pulses on the AS-I line. The amount of circuitry between ASI+ and ASI- pins is minimized to allow high

impedance values. When the transmitter is turned on, the receiver is turned off to reduce power consumption.

6.4

Digital Logic

The digital logic block performs analysis of the received signal, controls reaction of the IC, transmits slave

response, switches I/O-ports, and controls the internal EEPROM. Its principal function is described in detail in

section 7.

6.5

Protection Circuitry

The device has several protection cells that prevent disruption and malfunction of the complete AS-i line.

The thermal detection shuts down the power supply in case of over-heating condition (silicon temperature

> 140°C typically for more than 2 seconds) and when U

OUT

is shorted to GND for more than 2 seconds. The

device can only be reactivated by a power-on reset. An over-heating condition can occur by overloading any

output pin. Therefore, the circuit monitors the operating conditions of the power supply (effectively monitors

OUT

) and measures the temperature of the silicon.

6.6

Infrared Diode Input

The photo current input can be used as an alternative communication pin in slave mode. The IRD circuitry will

be turned off when the communication has been switched to AS-i line. In Slave mode the logic sets IRD input to

photo-detector mode and disables CMOS mode. In this photo-detector mode, signals of an external photo diode

are amplified. In CMOS mode (master/repeater mode only), input signals have to be CMOS levels between 0V

and V

U5R

6.7

Power-Fail Detection

The power-fail detector consists of a comparator that generates a logic signal in case the power supply drops

below 22V

(Power-Fail) for a time of more than t

Loff

(0.8

0.1 ms). The power fail signal will be presented at

pin P1 in master mode only.

Power-fail detection monitors the value of the ASIP voltage. It will activate a logic signal if power fails for more

than 1ms. The device is then buffered by the external capacitor at U

OUT

and the internal circuitry will be reset

when U5R supply voltage fails

Data Sheet, Rev. 2.4, March 04, 2002

4/31

A2SI-SR Related Products

	A2SI-SR	A2SI-MR	A2SI-MT	A2SI-ST
Description	Interface Circuit, CMOS, PDSO28, 5.30 MM, SSOP-28	Interface Circuit, CMOS, PDSO28, 5.30 MM, SSOP-28	Interface Circuit, CMOS, PDSO28, 5.30 MM, SSOP-28	Interface Circuit, CMOS, PDSO28, 5.30 MM, SSOP-28
Is it Rohs certified?	incompatible	incompatible	incompatible	incompatible
Maker	Zentrum Mikroelektronik Dresden AG (IDT)	Zentrum Mikroelektronik Dresden AG (IDT)	Zentrum Mikroelektronik Dresden AG (IDT)	Zentrum Mikroelektronik Dresden AG (IDT)
Parts packaging code	SSOP	SSOP	SSOP	SSOP
package instruction	SSOP,	SSOP,	SSOP,	SSOP,
Contacts	28	28	28	28
Reach Compliance Code	compliant	compliant	compliant	compliant
Interface integrated circuit type	INTERFACE CIRCUIT	INTERFACE CIRCUIT	INTERFACE CIRCUIT	INTERFACE CIRCUIT
JESD-30 code	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28
JESD-609 code	e0	e0	e0	e0
length	10.2 mm	10.2 mm	10.2 mm	10.2 mm
Humidity sensitivity level	3	3	3	3
Number of functions	1	1	1	1
Number of terminals	28	28	28	28
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C
Minimum operating temperature	-25 °C	-25 °C	-25 °C	-25 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SSOP	SSOP	SSOP	SSOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	240	240	240	240
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	2 mm	2 mm	2 mm	2 mm
Maximum supply voltage	33.1 V	33.1 V	33.1 V	33.1 V
Minimum supply voltage	16 V	16 V	16 V	16 V
surface mount	YES	YES	YES	YES
technology	CMOS	CMOS	CMOS	CMOS
Temperature level	OTHER	OTHER	OTHER	OTHER
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	0.65 mm	0.65 mm	0.65 mm	0.65 mm
Terminal location	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	30	30	30	30
width	5.3 mm	5.3 mm	5.3 mm	5.3 mm

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