19699-002-XTP ON Semiconductor, 19699-002-XTP Datasheet - Page 18

• Manufacturer Part Number: 19699-002-XTP
• Manufacturer: ON Semiconductor

Specifications of 19699-002-XTP

• Number Of Transmitters: 1
• Power Supply Requirement: Dual
• Package Type: LQFP
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / RoHS Status: Compliant

AMIS-49200
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-49200
5.1.1. Jabber Inhibit
The AMIS-49200 does not implement the Jabber Inhibit function in the μSAA22Q. Typically the AMIS-49200 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-49200 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 μSAA22Q recommends that the JAB/ signal (Pin 39) be connected to ground if the signal is not used. On AMIS-49200,
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-49200.
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-49200 it is required that these pins be grounded.
5.2 Pin Differences Between the μSAA22Q and the AMIS-49200
Table 12: Pin Connection Differences Between the µSAA22Q and the AMIS-49200
* MDS_CTRL is only connected to ground if POL is connected to VDD. See
MDS_CTRL and POL.
Pin No.
1
11
22
26
33
39
41
42
43
μSAA22Q
Signal Name
NC
NC
NC
NC
NC
JAB/
CJB
VTX
VSL
Recommended Connection
Ground
Ground
Ground
Ground
Ground
Ground if not used
1 μf cap
Ground
Ground
Rev. 5 | Page 18 of 22 | www.onsemi.com
AMIS-49200
Signal Name
VSS
VSS
VSS
MDS_CTRL
VSS
VSS
VSS
VSS
VSS
Table 1
for a detailed description of the interaction between
Required Connection
Ground
Ground
Ground
Ground*
Ground
Ground
Ground
Ground
Ground