Specifications

EMC-CS-2009.1

February 11, 2010

20.0 Immunity to Voltage Overstress: CI 270

These requirements are applicable to the following component categories:

Electronic Modules: A, AM, AX, AY

Electronic Controlled Electric Motors: EM

Electric Motors: BM

Passive Modules and Inductive Devices: P, R

20.1 Requirements

The component shall be immune from potential voltage overstress. This requirement is applicable to all power supply or

control circuits, either switched to, or directly connected to battery. The requirement is also applicable to control circuits

directly connected to switched battery connections or through an external pull-up resistor. Requirements are delineated in

Table 20-1. This requirement may be waived if analysis shows that the component will meet the requirements in Table 20-1.

However, the FMC EMC department shall review and concur on this analysis to avoid this testing.

Table 20-1: CI 270 Requirements for Voltage Overstress

Requirement

Functional Performance Status

Amplitude (V) Duration Class A Class B and C

-14 (-0.7, +0)  60 sec III III

19 (+0.95, -0)  60 min III II

24 (+1.2, -0)  60 sec

(1)

III I/II

(2)

1. Applicable to devices connected directly to battery or via the ignition switch. For devices connected

only to the start circuit, the duration time may be reduced to 15 sec.

Status I required for devices required for engine start (e.g.; PATS)

20.2 Test Setup and Verification

The DUT and any electronic hardware in the Load Simulator shall be powered from a DC power supply (see paragraph 4.5.4

for requirements). For these tests, the power supply shall have minimum short circuit capacity of 100 amperes.

A device that is reverse battery protected with a fused power circuit and a reverse biased diode in parallel with the device

shall be tested in a configuration representative of the vehicle. Example: If a vehicle fuse is used to protect the device, testing

shall be performed with the same fuse type. The fuse type shall be documented in the component engineering specification

and the EMC test plan.

20.3 Test Procedures

a) Apply –14 volts only to power circuits with direct battery connections. After 60 seconds, the same potential shall then

be applied to the remaining switched power and control circuits for 60 seconds while maintaining the same potential

on the direct battery connections. After completion of this test, apply normal +13.5 volts and verify that the DUT

powers up and functions properly.

Repeat step a) with 24 volts.

Apply +19 volts to all power and control circuits. All circuits shall be tested simultaneously. Verify functionality per

Table 20-1.