NXP Semiconductors
Application Note

Document Number: AN5063
Rev. 1.0, 7/2016

MC33910/11/12 filtering capacitor for VS11Introduction

The MC33910/11/12 family is a Serial Peripheral Interface(SPI) controlled System Basis Chip (SBC), combining manyfrequently used functions in an MCU based system, plus a
Local Interconnect Network (LIN) transceiver. The
SMARTMOS devices are low dropout regulators with full
protection and reporting features. The device provides full
SPI readable diagnostics and a selectable timing watchdog
for detecting errant operation. The LIN Protocol
Specification 2.0 and 2.1 compliant LIN transceiver has
waveshaping circuitry that can be disabled for higher datarates.
This application note explains how to use capacitor filter on
the VS1 input pin.

© 2016 NXP B.V.

Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Using capacitor filter . . . . . . . . . . . . . . . . . . . . . . . . 23 Application solution. . . . . . . . . . . . . . . . . . . . . . . . . 44 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Using capacitor filter

2Using capacitor filter

As you are working with the MC33910/11/12 devices, it is important that you understand the filtering mechanism for theproduct. The device may generate resets when spikes with falling slew rate in the range of -0.9 V/µs to -1.4 V/µs are appliedon VS1 pin. Below -1.4 V/μs and above -0.9 V/μs, the device functionality is guaranteed.

Figure 1. Falling slew rate on VS1 pin

MC33910/11/12 filtering capacitor for VS1, Rev. 1.0
NXP Semiconductors

2

Application solution

3

Application solution

If such behavior appears in the application, the ESR adjustment of C1 capacitor should be considered to ensure you haveprotected your application from the RESET condition. RESET condition is typically not found below -1.4 V/μs or above -0.9
V/μs.

33910/11/12

C1

Figure 2. Filtering capacitor on VS1 pinMC33910/11/12 filtering capacitor for VS1, Rev. 1.0
NXP Semiconductors

3References

4

References
Support Pages

URL

MC33910
Product Summary Page

http://www.nxp.com/webapp/sps/site/prod_summary.jsp?code=MC33910

MC33911
Product Summary Page

http://www.nxp.com/webapp/sps/site/prod_summary.jsp?code=MC33911

MC33912
Product Summary Page

http://www.nxp.com/webapp/sps/site/prod_summary.jsp?code=MC33912

Analog Home Page

http://www.nxp.com/analog

MC33910/11/12 filtering capacitor for VS1, Rev. 1.0
NXP Semiconductors

4

Revision history

5

Revision history
Revision
1.0

Date1/2015
7/2016

Description of Changes• Initial release• AN5063 replaces MC33910ER, MC33911ER, and MC33912ER• Updated to NXP document form and style

MC33910/11/12 filtering capacitor for VS1, Rev. 1.0
NXP Semiconductors

5How to Reach Us:

Information in this document is provided solely to enable system and software implementers to use NXP products. There

Home Page:
NXP.com

are no expressed or implied copyright licenses granted hereunder to design or fabricate any integrated circuits based onWeb Support:
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NXP makes no warranty, representation, or guarantee regarding the suitability of its products for any particular purpose,the information in this document. NXP reserves the right to make changes without further notice to any products herein.

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any and all liability, including without limitation, consequential or incidental damages. "Typical" parameters that may beprovided in NXP data sheets and/or specifications can and do vary in different applications, and actual performance mayvary over time. All operating parameters, including "typicals," must be validated for each customer application by thecustomer's technical experts. NXP does not convey any license under its patent rights nor the rights of others. NXP sells
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© 2016 NXP B.V.

Document Number: AN5063
Rev. 1.0
7/2016