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參數(shù)資料
| 型號(hào)： | MAX6602UE9A+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Five-Channel Precision Temperature Monitor |
| 中文描述： | 5-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 4.40 MM, ROHS COMPLIANT, MO-153AB, TSSOP-16 |
| 文件頁數(shù)： | 6/19頁 |
| 文件大小： | 243K |
| 代理商： | MAX6602UE9A+T |
MAX6602
Five-Channel Precision Temperature Monitor
14
______________________________________________________________________________________
BIT
NAME
POR
STATE
FUNCTION
7 (MSB)
Reserved
0
—
6
Reserved
0
Not Used. 0 at POR, then 1.
5
Reserved
0
Not Used. 0 at POR, then 1.
4
Diode fault 4
0
Channel 4 Remote-Diode Fault Bit. This bit is set to 1 when DXP4 and DXN4
are either shorted or open circuit.
3
Diode fault 3
0
Channel 3 Remote-Diode Fault Bit. This bit is set to 1 when DXP3 and DXN3
are either shorted or open circuit.
2
Diode fault 2
0
Channel 2 Remote-Diode Fault Bit. This bit is set to 1 when DXP2 and DXN2
are either shorted or open circuit.
1
Diode fault 1
0
Channel 1 Remote-Diode Fault Bit. This bit is set to 1 when DXP1 and DXN1
are either shorted or open circuit.
0
Reserved
0
—
Table 9. Status 3 Register
Applications Information
Remote-Diode Selection
The MAX6602 directly measures the die temperature of
CPUs and other ICs that have on-chip temperature-
sensing diodes (see the Typical Application Circuit) or
it can measure the temperature of a discrete diode-
connected transistor.
Effect of Ideality Factor
The accuracy of the remote temperature measure-
ments depends on the ideality factor (n) of the remote
“diode” (actually a transistor). The MAX6602 is opti-
mized for n = 1.012. A thermal diode on the substrate
of an IC is normally a pnp with the base and emitter
brought out the collector (diode connection) grounded.
DXP_ must be connected to the anode (emitter) and
DXN_ must be connected to the cathode (base) of this
pnp. If a sense transistor with an ideality factor other
than 1.012 is used, the output data is different from the
data obtained with the optimum ideality factor.
Fortunately, the difference is predictable. Assume a
remote-diode sensor designed for a nominal ideality
factor nNOMINAL is used to measure the temperature of
a diode with a different ideality factor n1. The measured
temperature TM can be corrected using:
where temperature is measured in Kelvin and
nNOMIMAL for the MAX6602 is 1.012. As an example,
assume you want to use the MAX6602 with a CPU that
has an ideality factor of 1.002. If the diode has no
series resistance, the measured data is related to the
real temperature as follows:
For a real temperature of +85°C (358.15K), the mea-
sured temperature is +81.46°C (354.61K), an error of
-3.539°C.
Series Resistance Cancellation
Some thermal diodes on high-power ICs can have
excessive series resistance, which can cause tempera-
ture measurement errors with conventional remote tem-
perature sensors. Channel 1 of the MAX6602 has a
series resistance cancellation feature (enabled by bit 3
of the configuration 1 register) that eliminates the effect
of diode series resistance. Set bit 3 to 1 if the series
resistance is large enough to affect the accuracy of
channel 1. The series resistance cancellation function
increases the conversion time for channel 1 by 125ms.
This feature cancels the bulk resistance of the sensor
and any other resistance in series (wire, contact resis-
tance, etc.). The cancellation range is from 0 to 100
Ω.
TT
n
TT
ACTUAL
M
NOMINAL
MM
=×
=×
=
1
1 012
1 002
1 00998
.
(.
)
TT
n
M
ACTUAL
NOMINAL
=
1
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