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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 VPERI. 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 (VUZPoffset) are
defined in separate points. The UZP buffer is defined in the following section.
Necessary for operation:
VEVZ = 8V to 40V or VCP = 10V to 50V, VVINT = 3.7V to 5.47V
Operating conditions of all other supply pins:
VK30, VVSAT, VVPERI and VVCORE are within functional range limits, Tj = –40°C to +150°C
Other pins:
As defined in Section 4. ”Functional Range” on page 8.
VUZP
Vmeas
ratio ratio tolerance±
--------------------------------------------------------VUZPoffset
±=
VUZP_max
Vin
VUZP_offset
VUZP_min
Vmeas
typ.
min.
max.
V
UZP