5.4
Tracking regulators
Four low drop-out tracking regulators (VSA, VSB, VSC and VSD) are supplied by the output
of the switching pre-regulator. They track the output voltage of the VDD5 linear regulator
with the accuracy as specified in the electrical characteristic table.
The VSA regulator also tracks an external voltage reference (TRACK_REF pin) and the
tracking voltage is selected by the REF_SEL pin.
If REF_SEL is tied High (5V) then VTRK_REF is tracked. If REF_SEL is left open then VDD5 is
tracked. There is an internal pull-down on REF_SEL.
The tracking supplies are intended to drive loads that are external to the ECU so they are
short circuit protected with the current limited. The outputs of the tracking regulators also
withstand short circuit to the battery.
A short circuit to GND, continuous or intermittent on one tracking supply will not affect any
other supply, including the preregulator output voltage VB. In addition to these requirements,
all sensor supplies shall be capable of operating with up to a 15μF load on the supply line.
This load may be present during initial startup, or be applied after the supply has been
powered up. In either case, the application of this load shall not cause the tracking
regulators to be permanently disabled.
VSB, VSC and VSD regulators can be disabled with VS_EN pin.
Vdd5 is a 5V regulator and can be tracked as VSA. VSA is designed for external circuits.
I doubt that the regulators were programed prior, but it would depend on a lot of stuff. I suppose and I think you suppose that Vsa is supposed to be 5V.
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When you remove part, cut the pins. Chip quick has some solder that will lower the melting point and it;s used for removal.
You may be able to get a stencil from
www.proto-advantage.com.
Otherwise flux, Solder the corners. and solder upside down. For some reason it works. e,g, 63/37 solder wiped across the terminals and the component faces in the direction that it would fall off.