AMIS42665 Extended Voltage Range

AND8364/D
AMIS-42665 Extended
Voltage Range
http://onsemi.com
APPLICATION NOTE
Introduction
Extended Voltage Range Test
This document provides the results of the AMIS−42665
high speed low power CAN transceiver when used in an
extended voltage range and answers whether or not the
AMIS−42665 can operate at a voltage level of 5.5 V $
0.1 V.
The AMIS−42665 can operate within the extended
voltage range (5.4 V < VCC < 5.6 V) without any risk or
damage or reduced lifetime.
ON Semiconductor can not be hold responsible if the ISO
11898 standard is not met outside the normal operating
range (4.75 V < VCC < 5.25 V).
However, measurements on a limited set of samples at
room temperature shows that at the extended voltage range
all parameters are within the ISO 11898 standard.
Being in line with the ISO 11898 standard is only
guaranteed if the power supply VCC is between 4.75 V and
5.25 V (normal operating voltage). To check the behavior of
the AMIS−42665 outside this normal operating voltage,
tests were done at higher supply voltage. The supply
voltages used were 5 V, 5.25 V, 5.5 V, 5.75 V, and 6 V.
All tests were done on two devices. Each device was
tested four times on every supply voltage VCC with TA =
25°C.
A resistor of 60 W (RL) parallel with a capacitor of 100 pF
(CL) was placed between the CANH and CANL pin as bus
termination. The transceiver was operating in normal mode.
Test Results
General
Dominant Bus Voltages
The AMIS−42665 CAN transceiver is the interface
between a controller area network (CAN) protocol
controller and the physical bus. It may be used in both 12 V
and 24 V systems. The transceiver provides differential
transmit capability to the bus and differential receive
capability to the CAN controller.
Perfect operation of the AMIS−42665 CAN transceiver is
guaranteed if the supply voltage VCC is between 4.75 V and
5.25 V (4.75 V < VCC < 5.25 V). The absolute maximum
supply voltage is 7 V. Permanent device failure is possible
when going above this absolute maximum rating.
For more info about the AMIS−42665 CAN transceiver
refer
to
the
AMIS−42665
datasheet
(http://www.onsemi.com/).
© Semiconductor Components Industries, LLC, 2009
January, 2009 − Rev. 0
Figure 4 represents the voltages on the CANH and CANL
bus in dominant state for the different supply voltages
(VCC). Also shown are the data sheet values. These are the
maximum and minimum values that are guaranteed.
However, this guarantee is only applicable when VCC is
between 4.75 V and 5.25 V (4.75 V < VCC < 5.25 V).
Figure 4 shows that CANH will go above the maximum
dominant CANH voltage (data sheet). Within the extended
voltage range, however, the dominant CANH voltage stays
below the maximum dominant CANH voltage (datasheet).
Be aware, this was tested on only two samples (statistically
not significant).
Figure 1 gives a better view on how VCANH and VCANL
are measured.
1
Publication Order Number:
AND8364/D
AND8364/D
Figure 1. Set−up VCANH and VCANL
Differential Bus Output Voltages
ViDifHi_pos is measured as:
VCANL = 12 V, binary search VCANH from 12.4 V to 13 V
and look for change from ’1’ to ’0’ on pin RxD (see also
Figure 2).
ViDifHi_neg is measured like next:
VCANH = −5 V, binary search VCANL from –5.4 V to –6 V
and look for change from ’1’ to ’0’ on pin RxD (see also
Figure 3).
Figure 6 shows the minimum and maximum differential
receiver high threshold voltage (datasheet). Again, this
minimum and maximum is only guaranteed within a voltage
range of 4.75 V and 5.25 V (4.75 V < VCC < 5.25 V).
ViDifHi_pos and ViDifHi_neg will go higher than the
maximum but this is outside the extended voltage range.
Again, this was measured only on two samples (statistically
not significant).
Figure 5 represents the differential bus output voltage
(VCANH – VCANL) in dominant state. Two different
measurements are done, RL = 60 W and RL = 42.5 W. The
chart also displays the minimum and maximum differential
bus output voltage (data sheet). Be aware, this minimum and
maximum is only guaranteed if the voltage supply VCC is
between 4.75 V and 5.25 V (4.75 V < VCC < 5.25 V).
One can see that the differential bus output voltage, when
RL = 60 W, will go above 3 V. In the extended voltage range,
however, this stays below the 3 V. Again, this was tested
only on two samples (statistically not significant).
For this test, a similar set−up as in previous test was used
(see Figure ) with the exception that the test was also done
with RL = 42.50 W.
Differential Bus Receiver Thresholds
Figure 6 shows the differential receiver high threshold
voltage for CMV = +12 V (ViDifHi_pos) and for CMV = −5 V
(ViDifHi_neg).
http://onsemi.com
2
AND8364/D
Figure 2. Differential Receiver High Threshold Voltage for CMV = +12 V
Figure 3. Differential Receiver High Threshold Voltage for CMV = −5 V
http://onsemi.com
3
AND8364/D
5.5
Extended
voltage range
5
4.5
Expected but not guaranteed
maximum CANH dominant
Max CANH voltage dominant
Dominant CANH voltage
4
VCAN (V)
3.5
Min CANH voltage dominant
3
2.5
2
Max CANL voltage dominant
1.5
Dominant CANL voltage
1
Min CANL voltage dominant
0.5
0
4.75
5
5.25
5.5
VCC (V)
5.75
6
Minimum and maximum CAN−bus voltages are
only guaranteed in this supply voltage range
Figure 4. AMIS−42665 CAN−Bus Voltages
Extended voltage
range
3.5
Expected but not guaranteed
maximum Vdif dominant voltage
Vdiff (bus_dom, RL = 60 W)
Vdiff (V)
3
Max Vdiff (42.5 W < RL < 60 W, dom)
2.5
Vdiff (bus_dom, RL = 42.5 W)
2
1.5
Min Vdiff (42.5 W < RL < 60 W, dom)
1
4.75
5
Minimum and maximum Vdiff is only guaranteed in
this supply voltage range
5.25
5.5
VCC (V)
Figure 5. AMIS−42665 Dominant Differential Bus Output Voltage
http://onsemi.com
4
5.75
6
AND8364/D
1100
Extended voltage
range
Expected but not guaranteed
maximum ViDifHi voltage
1000
900
V iDifHi_neg
Max ViDifHi (datasheet)
ViDifHi (mV)
V iDifHi_pos
800
700
600
500
Min ViDifHi (datasheet)
400
4.75
5
5.25
VCC (V)
5.5
5.75
6
Minimum and maximum ViDifHi is only guaranteed
in this supply voltage range
Figure 6. AMIS−42665 Differential Receiver High Threshold Voltage
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent
rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur.
Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries,
affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury
or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an
Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: [email protected]
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5773−3850
http://onsemi.com
5
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
AND8364/D
Similar pages