CAT6095
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12
Register Data Format
The values used in the temperature data register and the 3
temperature  trip  point  registers  are  expressed  in  twos
complement format. The measured temperature value is
expressed  with  12bit  resolution,  while  the  3  trip
temperature limits are set with 10bit resolution. The total
temperature  range  is  arbitrarily  defined  as  256癈,  thus
yielding an LSB of 0.0625癈 for the measured temperature
and 0.25癈 for the 3 limit values. Bit B12 in all temperature
registers represents the sign, with a 0 indicating a positive,
and a 1 a negative value. In twos complement format,
negative  values  are  obtained  by  complementing  their
positive counterpart and adding a 1, so that the sum of
opposite signed numbers, but of equal absolute value, adds
up to zero.
Note that trailing 0 bits, are 0 irrespective of polarity.
Therefore the dont care bits (B1 and B0) in the 10bit
resolution temperature limit registers, are always 0.
Table 13. 12BIT TEMPERATURE DATA FORMAT
Binary (B12 to B0)
Hex
Temperature
1  1100 1001 0000
1C90
55癈
1  1100 1110 0000
1CE0
50癈
1  1110 0111 0000
1E70
25癈
1  1111 1111 1111
1FFF
0.0625癈
0  0000 0000 0000
000
0癈
0  0000 0000 0001
001
+0.0625癈
0  0001 1001 0000
190
+25癈
0  0011 0010 0000
320
+50癈
0  0111 1101 0000
7D0
+125癈
Event Pin Functionality
The EVENT
 output reacts to temperature changes as
illustrated in Figure 15, and according to the operating mode
defined by the Configuration register.
In Interrupt Mode, the enabled EVENT
 output will be
asserted every time the temperature crosses one of the alarm
window limits, and can be deasserted by writing a 1 to the
clear event bit (B5) in the configuration register. When the
temperature exceeds the critical limit, the event remains
asserted as long as the temperature stays above the critical
limit and can not be cleared.
In Comparator Mode, the EVENT
 output is asserted
outside  the  alarm  window  limits,  while  in  Critical
Temperature Mode, EVENT
 is asserted only above the
critical limit. The exact trip limits are determined by the 3
temperature  limit  settings  and  the  hysteresis  offsets,  as
illustrated in Figure 16.
Following  a  TS  shutdown  request,  the  converter  is
stopped and the most recently recorded temperature value
present in the TDR is frozen; the EVENT
 output will continue
to reflect the state immediately preceding the shutdown
command.  Therefore,  if  the  state  of  the  EVENT
  output
creates an undesirable bus condition, appropriate action must
be taken either before or after shutting down the TS. This may
require clearing the event, disabling the EVENT
 output or
perhaps changing the EVENT
 output polarity.
In  normal  use,  events  are  triggered  by  a  change  in
recorded temperature, but the CAT6095 will also respond to
limit  register  changes.  Whereas  recorded  temperature
values are updated at sampling rate frequency, limits can be
modified at any time. The enabled EVENT
 output will react
to limit changes as soon as the respective registers are
updated. This feature may be useful during testing.