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Amux (analog multiplexer for voltage measurements), Ata6264 [preliminary – Atmel ATA6264 User Manual

Page 62

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62

4929B–AUTO–01/07

ATA6264 [Preliminary]

19. AMUX (Analog Multiplexer for Voltage Measurements)

Various voltages and the chip temperature inside of the ATA6264 can be measured at the ana-
log measurement output UZP. Different voltage dividers ensure that the values of the measured
voltages at UZP are in the range of 0V to V

PERI

. To select a specific measurement, a serial inter-

face command has to be sent to the ATA6264.

For the list of measurable voltages and temperatures, refer to

Section 22. ”Serial Interface Com-

mands” on page 68

. The overall accuracy of the measurement part inside the ATA6264 can be

calculated using the following formula:

Figure 19-1. AMUX Tolerances

In order to describe the behavior of the whole measurement properly, the tolerance of the volt-
age-divider ratio (ratio tolerance) and the offset tolerance of the UZP buffer (V

UZPoffset

) are

defined in separate points. The UZP buffer is defined in the following section.

Necessary for operation:
V

EVZ

= 8V to 40V or V

CP

= 10V to 50V, V

VINT

= 3.7V to 5.47V

Operating conditions of all other supply pins:
V

K30

, V

VSAT

, V

VPERI

and V

VCORE

are within functional range limits, T

j

= –40°C to +150°C

Other pins:
As defined in

Section 4. ”Functional Range” on page 8

.

V

UZP

V

meas

ratio

ratio

tolerance

±

--------------------------------------------------------

V

UZPoffset

±

=

V

UZP_max

V

in

V

UZP_offset

V

UZP_min

Vmeas

typ.

min.

max.

V

UZP