aTS75
Temperature Register
Configuration Register
The Temperature Register is a two-byte (16-bit) read-only
register. Digital temperatures from the T-to-D converter are
stored in the Temperature Register in two’s complement
format, and the contents of this register are updated at
regular intervals—i.e., each time the T-to-D conversion is
finished.
The Configuration Register is a one-byte (8-bit) read/write
register (see Figure 5). This register allows the user to
control the aTS75 Shutdown Mode as well as the following
thermal alarm features: polarity, operating mode, and fault
tolerance. The Configuration Register contains two bits that
set the fault tolerance trip point. The fault tolerance trip
point is the number of consecutive times the internal circuit
reads the temperature and finds the temperature outside of
the limits programmed. The programmed limits are defined
by the TOS Register for the upper limit, and by the THYST
Register for the lower limit. Table 4 shows the relationship
between F1 and F0 and the number of consecutive errors
or "trips" needed to activate the alarm. The Configuration
Register also contains two bits that set the T-to-D
conversion resolution to 9-, 10-, 11-, or 12-bits. Table 3
shows the relationship between R1 and R0 and the
conversion resolution. All bits in the Configuration Register
default to zero at power-up.
The user can read data from the Temperature Register at
any time. When a T-to-D conversion is completed, the new
data is loaded into a comparator buffer to evaluate fault
conditions, and will update to the Temperature Register if a
read cycle is not ongoing. The aTS75 is continuously
evaluating fault conditions regardless of read or write
activity on the bus. If a read is ongoing, the previous
temperature will be read. The readable temperature will be
updated upon the completion of the next T-to-D conversion
that is not masked by a read cycle.
The Temperature Register is illustrated in Figure 4.
Depending on the resolution of the T-to-D conversion, the
9, 10, 11 or 12 LSB's of the register will contain
temperature data. All unused bits following the digital
MSB
LSB
CMP/
INT
X
R1
F1
F0 POL
SD
R0
temperature will be zero.
The MSB position of the
R1 = Resolution bit 1. (See Table 3)
R0 = Resolution bit 0 . (See Table 3)
F1 = Fault tolerance bit 1. (See Table 4)
F0 = Fault tolerance bit 0 . (See Table 4)
POL = O.S. output polarity. 0 = active low, 1 = active high.
CMP/INT = Thermostat mode.
Temperature Register always contains the sign bit for the
digital temperature and bit 14 contains the temperature
MSB. All bits in the Temperature Register default to zero at
power-up.
MSB
14
12
11
13
10
9
8
0 = Comparator Mode, 1 = Interrupt Mode.
SD = Shutdown. 0 = normal operation. 1 = Shutdown Mode
T
T
T
T
T
SB
T
TMSB
Figure 5. Configuration Register Format
Table 3. Conversion Resolution Settings
7
6
4
2
5
3
1
LSB
11-bit 12-bit
LSB LSB
9-bit
LSB
10-bit
LSB
0
0
0
0
SB = Two’s complement sign bit
TMSB = Temperature MSB
T = Temperature data
9-bit LSB = Temperature LSB for 9-bit conversions
10-bit LSB = Temperature LSB for 10-bit conversions
11-bit LSB = Temperature LSB for 11-bit conversions
A-to-D Conversion
R1 R0
Resolution
9 Bits
10 Bits
11 Bits
12 Bits
0
0
1
1
0
1
0
1
12-bit LSB = Temperature LSB bit for 12-bit conversions
Figure 4. Temperature Register Format
Table 4. Fault Tolerance Settings
Fault
Tolerance
F1 F0
1
2
4
6
0
0
1
1
0
1
0
1
- 7 -
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© Andigilog, Inc. 2005
April 2006 - 70A03204
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