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© Andigilog, Inc. 2005
www.andigilog.com
April 2006 - 70A03204
aTS75
Over-Limit-Signal Temperature Register (TOS)
The TOS Register is a two-byte (16-bit) read/write register
that
stores
the
user-programmable
upper
trip-point
temperature for the thermal alarm in two’s-complement
format.
At power-up this register defaults to 80°C (i.e.,
0101 0000 0000 0000.
The format of the TOS Register is identical to that of the
Temperature Register (see Figure 6). The 4 LSBs of the
TOS Register are hardwired to zero, so data written to these
register bits will be ignored. The MSB position of the TOS
Register contains the sign bit for the digital temperature
and bit 14 contains the temperature MSB.
The resolution setting for the T-to-D conversion determines
how many bits of the TOS Register are used by the thermal
alarm.
For example, for 9-bit conversions the trip-point
temperature is defined by the 9 MSBs of the TOS Register,
and all remaining bits are “don’t cares”.
Hysteresis Temperature Register (THYST)
The THYST Register is a two-byte (16-bit) read/write register
that
stores
the
user
programmable
lower
trip-point
temperature for the thermal alarm in two's complement
format. At power-up this register defaults to 75°C (i.e.,
0100 1011 0000 0000).
The THYST Register is illustrated in Figure 6. The format of
this register is the same as
that of the Temperature
Register. The 4 LSBs of the THYST Register are hardwired
to zero, so data written to these bits is ignored.
The resolution setting for the T-to-D conversion determines
how many bits of the THYST Register are used by the
thermal alarm.
For example, for 9-bit conversions the
hysteresis temperature is defined by the 9 MSBs of the
THYST Register, and all remaining bits are “don’t cares”.
SB = Two’s complement sign bit
TMSB = Hysteresis temperature MSB
T = Temperature data
9-bit LSB = Hysteresis temperature LSB for 9-bit conversions
10-bit LSB = Hysteresis temperature LSB for 10-bit conversions
11-bit LSB = Hysteresis temperature LSB for 11-bit conversions
12-bit LSB = Hysteresis temperature LSB for 12-bit conversions
LSB
9-bit
LSB
10-bit
LSB
11-bit
LSB
12-bit
LSB
0
0
0
0
MSB
SB TMSB
T
T
T
T
T
T
10
9
8
7
6
5
4
3
2
1
14
13
12
11
Figure 6. THYST Register and TOS Register Format
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