with Internal Temperature Sensor and VDD
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MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and VDD Monitor
26
______________________________________________________________________________________
Automatic Reference Shutdown
The MAX1253/MAX1254 enter an automatic shutdown
mode when in reference mode 00 or when the sample
wait is greater than 80s in reference mode 01. Using
either of these reference modes and a sample wait
period as long as the application allows results in the
lowest power consumption.
Temperature Measurement
The MAX1253/MAX1254 support both single-ended
and differential temperature measurements. The design
decision between the two types of measurements
depends on the desired level of accuracy and on type
and/or number of temperature sensors. The superior
common-mode rejection and lower noise of the differ-
ential mode reduces measurement errors and provides
higher accuracy, while single-ended measurements
require a lower number of connections, resulting in a
simpler implementation and a higher number of moni-
tored points for each MAX1253/MAX1254.
Differential Temperature Measurement
Connect the anode of a diode-connected transistor to
the even input channel and the cathode to the odd
input channel of an input pair configured for differential
temperature measurement (AIN0/AIN1, AIN2/AIN3,
AIN4/AIN5, or AIN6/AIN7). Run the two sensor connec-
tion lines parallel to each other with minimum spacing.
This improves temperature measurement accuracy by
minimizing the differential noise between the two lines,
since they have equal exposure to most sources of
noise. For further improved noise rejection, shield the
two sensor connections by running them between
ground planes, when available.
Configure the MAX1253/MAX1254 inputs for differential
temperature measurement in the input configuration
register (see Tables 9 and 10) and enable the even
channel number in the channel enable register (see
Table 4).
Single-Ended Temperature Measurement
Connect the anode of a diode-connected transistor to
the input channel and the cathode to ground. Choose
ground connections for sensors away from high-current
return paths to avoid the introduction of errors caused by
voltage drops in the board/system ground, which is the
main drawback for single-ended measurements.
Practical options for better accuracy are the use of a
star-configured subsystem ground or a signal ground
plane; to isolate the anode sensor connection trace away
from board and system noise sources; or to shield it with
ground lines and ground planes (when available) to pre-
vent accuracy degradation in the temperature measure-
ments caused by magnetic/electric noise induction.
Configure the MAX1253/MAX1254 input used for single-
ended temperature measurement in the input configura-
tion register (see Tables 9 and 10) and enable the analog
input in the channel-enable register (see Table 4).
Remote Temperature Sensor Selection
Temperature-sensing accuracy depends on having a
good-quality, diode-connected, small-signal transistor
as a sensor. Accuracy has been experimentally verified
for 2N3904-type devices. The transistor must be a
small-signal type with low base resistance. Tight speci-
fications for forward current gain (+50 to +150, for
example) indicate that the manufacturer has good
process controls and that the devices have consistent
VBE characteristics. CPU on-board sensors and other
ICs鈥� on-board temperature-sensing devices can also
be used (see Table 16 for recommended devices).
Table 16. Remote Sensor Transistor
Manufacturers
MANUFACTURER
MODEL NUMBER
Central Semiconductor (USA)
CMPT3904
Fairchild Semiconductors (USA)
MMBT3904
Motorola (USA)
MMBT3904
Rohm Semiconductor (Japan)
SST3904
Siemens (Germany)
SMB3904
Zetex (England)
FMMT3904CT-ND
Diodes Inc.
MMBT3904
OUTPUT CODE
FULL-SCALE
TRANSITION
11....111
0
INPUT VOLTAGE (LSB)
ZS = 0
FS = VREF
11....110
11....101
00....011
00....010
00....001
00....000
2
13
FS
1 LSB =
VREF
4096
FS = 3/2 LSB
Figure 10. Unipolar Transfer Function, Full Scale (FS) = VREF
鐩搁棞(gu膩n)PDF璩囨枡
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