參數(shù)資料
型號(hào)： AMIS-49250-XTP
廠商： ON Semiconductor
文件頁(yè)數(shù)： 10/22頁(yè)
文件大?。?/td> 0K
描述： IC TXRX FIELDBUS MAU 44NQFP
標(biāo)準(zhǔn)包裝： 2,500
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： MDS-MAU
電源電壓： 4.75 V ~ 6.2 V
安裝類型： 表面貼裝
封裝/外殼： 44-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 44-NQFP（7x7）
包裝： 帶卷 (TR)
AMIS-492x0
5.0 AMIS-49200 as Replacement for Yokogawa
μSAA22Q
The AMIS-49200 is a near pin-for-pin compatible replacement for the Yokogawa
μSAA22Q 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
μSAA22Q would most likely be able to use the AMIS-49200
in designs with only some component value changes.
5.1 Functional Differences Between the
μSAA22Q and the AMIS-492x0
5.1.1. Jabber Inhibit
The AMIS-492x0 does not implement the Jabber Inhibit function in the
μSAA22Q. 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.
μSAA22Q 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.
5.1.2. Low Power Mode
The low power mode on the
μSAA22Q allows the user to have a quiescent current draw of less than 10mA 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
μSAA22Q, these three pins are grounded.
On the AMIS-492x0 it is required that these pins be grounded.
5.2 Pin Differences Between the
μSAA22Q and the AMIS-492x0
Table 12: Pin Connection Differences Between the SAA22Q and the AMIS-492x0
μSAA22Q
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
μf 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.
Rev. 6 | Page 18 of 22 | www.onsemi.com
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