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UM1693

Protection against battery transients

195

Moreover M0-7 Monolithic HSDs pass the load dump clamped pulse test (class C according

to Table 7 criteria) relevant to the standard ISO-7637-2:2004(E) (5b pulse with 40 V

centralized load dump suppressor) as well as the standard ISO 16750-2:2010 (E) (pulse

with 35 V centralized load dump suppressor).

3.6

Component dimensioning for hybrid devices

Differently from monolithic devices, the Hybrids do not need the external reverse battery

protection network since they have an embedded protection formed by an anti-parallel

Zener diode which prevents the signal clamp activation (refer to Figure 5). Moreover the

reverse battery event enables the self turn-on of output channels. For this reason, during the

ISO transients, the parasitic structures of I/O pins are softly triggered with no high current

flowing through them. Nevertheless, as precaution, a serial protection resistance is

suggested between microcontroller and logic pins to limit the current flowing. Hybrid devices

are fully compliant with the tests level specified in the ISO 7637-2: 2004 (see the relevant

table for more details).

Table 7. ISO 7637-2 2004 and 2011 tests and results on monolithic HSDs

ISO

7637-2

TEST PULSE

Level III

Level IV

Level III

Level IV(1)

Level III

Level IV

Level III

Level IV

2004

Class C

Class B

2011

Class C

Class C or E(1)

Class B

Class C: full operational after each pulse

Class B: full operational even during pulses exposure

Class E: One or more functions of the device do not perform as designed after exposure to disturbance

and cannot be returned to proper operation without replacing the device

The results on pulse ISO7637-2 2011 2a level IV depend mainly on load status and condition (open load, nominal load,

shorted load, resistive load, inductive load, capacitive load). Lower ohmic loads with low inductive contribution help to

increase the sustainable peak voltage for the device reaching Class C compliance. Tests performed on VND7020AJ-E, for

example, give as result class C in the condition ON state with a resistive load equivalent to the nominal one on each output

(see Figure 20); instead they give class E with Outputs in open load.

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