AMIS-49250-XTD Datasheet AMIS-49200-XTD, AMIS-49200-XTP, AMIS-49250-XTD | P13-P15

AMIS−492x0

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AMIS−49200 AS REPLACEMENT FOR YOKOGAWA mSAA22Q

The AMIS−49200 is a near pin-for-pin compatible

replacement for the Yokogawa mSAA22Q Fieldbus MAU.

There are some differences between the two chips both in the

internal operation, the required external connections and the

value (or existence) of some of the external components.

These differences are small and those who used the

mSAA22Q would most likely be able to use the

AMIS−49200 in designs with only some component value

changes.

Functional Differences between the mSAA22Q

and the AMIS−492x0

Jabber Inhibit

The AMIS−492x0 does not implement the Jabber Inhibit

function in the mSAA22Q. Typically the AMIS−492x0 will

be connected with a link controller chip such as the

UFC100−F1 from Aniotek/Softing. This link controller has

a Jabber Inhibit function so the absence of this function in

the AMIS−492x0 should not be a problem.

As can be seen in Table 12, MDS_CTRL is only

connected to ground if POL is connected to VDD. See

Table 1 for a detailed description of the interaction between

MDS_CTRL and POL.

In Table 12, the mSAA22Q recommends that the JAB/

signal (Pin 39) be connected to ground if the signal is not

used. On AMIS−492x0, Pin 39 must be connected to

ground.

Low Power Mode

The low power mode on the mSAA22Q allows the user to

have a quiescent current draw of less than 10 mA yet still

communicate at the proper IEC 61158−2 signal levels. Very

few, if any, Fieldbus devices are capable of operating at such

a low current level so this capability was not included in the

AMIS−492x0.

The pins affected by this are 41, 42 and 43. If the low

power mode is not being used on the mSAA22Q, these three

pins are grounded. On the AMIS−492x0 it is required that

these pins be grounded.

Pin Differences between the mSAA22Q

and the AMIS−492x0

Pin differences are shown in Table 12.

Table 12. PIN CONNECTION DIFFERENCES BETWEEN THE mSAA22Q AND THE AMIS−492x0

mSAA22Q

AMIS−492x0

Pin No. Signal Name

Recommended

Connection

Signal Name Required Connection

1 NC Ground VSS Ground

11 NC Ground VSS Ground

22 NC Ground VSS Ground

26 NC Ground MDS_CTRL Ground*

33 NC Ground VSS Ground

39 JAB/ Ground if Not Used VSS Ground

41 CJB

1 mF cap

VSS Ground

42 VTX Ground VSS Ground

43 VSL Ground VSS Ground

*MDS_CTRL is only connected to ground if POL is connected to VDD. See Table 1 for a detailed description of the interaction between

MDS_CTRL and POL.

External Circuitry

Figure 11 shows the external circuitry required to connect

the AMIS−492x0 to an IEC 61158−2 conformant network.

This schematic is the circuit that was used to pass the

FOUNDATION Fieldbus Physical Layer Conformance test

as specified in FOUNDATION Fieldbus specification

FF830, Rev 1.5. This circuit is similar but not identical to the

circuit recommended by Yokogawa for the mSAA22Q.

Table 13 lists the four external component values that

need to be changed with using the AMIS−492x0 in a circuit

that previously used the mSAA22Q.

Table 13. PASSIVE EXTERNAL COMPONENT VALUE

DIFFERENCES BETWEEN THE mSAA22Q AND THE

AMIS−492x0

Component

mSAA22Q Value

AMIS−492x0 Value

C1 100 pF 150 pF

C3 100 pF 47 pF

C4 470 pF 220 pF

C8 10 nF

1 mF

AMIS−492x0

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Figure 11. AMIS−492x0 Reference Circuit Implementation

(38) POL

(17) VDO

(16) VO

(2) INTREF

(5) PFAIL2/

(36) TXE

(37) TXS

(34) RXA

(35) RXS

(26)

MDS_CTRL

Digital Vdd

Series Voltage

Regulator Out

N/C

System

Reset

Transmit

Data

Receive

Data

SIGIN (27)

HPF (28)

VMID (3)

CCIN− (24)

VCC (44)

VCC (18)

SHUNT (8)

CCOUT (25)

CCIN+ (23)

VDRV (21)

220 pF

SRSETIN (12)

SRSET (13)

SHSETIN (6)

SHSET (7)

SRTR (15)

SRAO (14)

FLTOUT (31)

FLT (30)

(9) SGND

(10 11 20 22 33 39 40) VSS

(1) MOUT

(43) MS2

(42) MS1

(41) MS0

(4) PFAIL1/

(32) CCD

(19) CRT

(29) LPF

47 pF

22 pF

150 pF

AMIS−492x0

C11

47 pF

R11

49.9 kW

R12

249 kW

1 nF

3.3 nF

5.11 kW

51.1 kW

1 mF

249 kW

49.9 kW

D1 D2

100 kW

330 pF

5.1 V

V Shunt

C10

22 mF

2 kW

R10

10 W

8.2 W

1 kW

510 W

−

H1 Segment

D1, D2: BAV99

D3: BZX84C5V1

Q1, Q4: MMBT3904LT1

Q2, Q3: MMBT2907ALT1

AMIS−492x0

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C1 connects to signal CCD (Pin 32) and controls the

carrier detect assert and drop-out timing. Particular

implementations may require that the value of C1 be

changed to accommodate received signal level changes

introduced by the addition of intrinsic safety components

added to the external circuitry. C3 and C4 are part of the

receive filter and determine the band pass characteristics of

the receive filter. It is unlikely that these would need to be

changed. C8 is a noise filter for VMID. It is important that

VMID have as little noise as possible as it is used as a

reference for many sub-circuits in the AMIS−492x0. C8

must be a large capacitor with maximum of 100 nF. C8

recommended value is 1 mF.

There is one other minor difference in the recommended

external circuitry between the mSAA22Q and the

AMIS−492x0. Figure 12 shows the start-up circuits

recommended for the mSAA22Q and the AMIS−492x0. The

circuit shown for the AMIS−492x0 is different from that

shown for the mSAA22Q but either one will work. Both are

current sources that turn on when power is applied to the H1

segment terminals so that the AMIS−492x0 can turn on

without any turn-on transients on the network.

Figure 12. Recommended Start-up Circuits

Loop +

V Shunt

Loop +

V Shunt

1 kW

100 kW

5.1 V

mSAA22Q

Start-up Circuit

AMIS−49200

Start-up Circuit

Active Components

Transistors Q1–Q4 are ordinary small signal transistors.

Diodes D1 and D2 are similarly ordinary small signal

diodes. Users desiring to replace a mSAA22Q with the

AMIS−49200 in an existing design should be able to use

whatever transistors and diodes were used with the

mSAA22Q. For new designs, the specified transistors can be

used or other devices may be chosen.

Alternative Designs

Some users of the Yokogawa mSAA22Q did not use the

exact recommended external circuit for the media interface

circuit (see Figure 11). Using the AMIS−492x0 without the

Yokogawa recommended external circuit may result in

some compatibility problems. There are many alternative

designs and it is beyond the scope of this document to

identify all possible configurations and their associated

design implications. Please refer to the AMIS−492x0

Fieldbus MAU Reference Design Application Note for a

recommended, FOUNDATION Fieldbus certifiable board

design.

Verification

All designs using the AMIS−492x0 should re-run the

entire physical layer conformance test as defined in

FOUNDATION Fieldbus document FF−830,

FOUNDATION

Specification 31.25 kbit/s Physical Layer

Conformance Test. Board layout can alter the behavior of all

circuit implementations, even designs that follow the

recommended implementation.

Table 14. ORDERING INFORMATION

Part Number Package Temperature Range Shipping

†

AMIS−49200−XTD 44 LQFP 10 × 10 mm

(Pb−Free/RoHS Compliant)

−40°C to 85°C 160 / Tray

AMIS−49200−XTP 44 LQFP 10 × 10 mm

(Pb−Free/RoHS Compliant)

−40°C to 85°C 1,500 / Tape & Reel

AMIS−49250−XTD 44 NQFP 7 × 7 mm

(Pb−Free/RoHS Compliant)

−40°C to 85°C 160 / Tray

AMIS−49250−XTP 44 NQFP 7 × 7 mm

(Pb−Free/RoHS Compliant)

−40°C to 85°C 1,500 / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specification Brochure, BRD8011/D.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P20

AMIS-49250-XTD

Mfr. #:

Buy AMIS-49250-XTD

Manufacturer:

ON Semiconductor

Description:

Bus Transceivers Field Bus MAU Transceiver

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AMIS-49250-XTD

AMIS-49250-XTD

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