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參數資料
| 型號： | MAX6689_07 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 7-Channel Precision Temperature Monitor |
| 中文描述： | 7通道高精度溫度監(jiān)測 |
| 文件頁數： | 16/19頁 |
| 文件大?。?/td> | 248K |
| 代理商： | MAX6689_07 |
M
ADC Noise Filtering
The integrating ADC has good noise rejection for low-
frequency signals, such as power-supply hum. In envi-
ronments with significant high-frequency EMI, connect
an external 2200pF capacitor between DXP_ and
DXN_. Larger capacitor values can be used for added
filtering, but do not exceed 3300pF because it can
introduce errors due to the rise time of the switched
current source. High-frequency noise reduction is
needed for high-accuracy remote measurements.
Noise can be reduced with careful PCB layout as dis-
cussed in the
PCB Layout
section.
Slave Address
Table 11 shows the MAX6689 slave addresses.
Table 11. Slave Address
PCB Layout
Follow these guidelines to reduce the measurement
error when measuring remote temperature:
1) Place the MAX6689 as close as is practical to the
remote diode. In noisy environments, such as a
computer motherboard, this distance can be 4in to
8in (typ). This length can be increased if the worst
noise sources are avoided. Noise sources include
CRTs, clock generators, memory buses, and PCI
buses.
2) Do not route the DXP-DXN lines next to the deflec-
tion coils of a CRT. Also, do not route the traces
across fast digital signals, which can easily intro-
duce +30°C error, even with good filtering.
3) Route the DXP and DXN traces in parallel and in
close proximity to each other. Each parallel pair of
traces should go to a remote diode. Route these
traces away from any higher voltage traces, such as
+12VDC. Leakage currents from PCB contamination
must be dealt with carefully since a 20M
Ω
leakage
path from DXP to ground causes about +1°C error.
If high-voltage traces are unavoidable, connect
guard traces to GND on either side of the DXP-DXN
traces (Figure 5).
4) Route through as few vias and crossunders as pos-
sible to minimize copper/solder thermocouple
effects.
5) Use wide traces when practical. 5mil to 10mil traces
are typical. Be aware of the effect of trace resis-
tance on temperature readings when using long,
narrow traces.
6) When the power supply is noisy, add a resistor (up
to 47
Ω
) in series with V
CC
.
7-Channel Precision Temperature Monitor
16
______________________________________________________________________________________
5–10 mils
5–10 mils
5–10 mils
MINIMUM
5–10 mils
GND
DXP
DXN
GND
Figure 5. Recommended DXP-DXN PCB Traces. The two outer
guard traces are recommended if high-voltage traces will be
near the DXN and DXP traces.
MANUFACTURER
Central Semiconductor (USA)
Rohm Semiconductor (USA)
Samsung (Korea)
Siemens (Germany)
Zetex (England)
MODEL NO.
CMPT3904
SST3904
KST3904-TF
SMBT3904
FMMT3904CT-ND
Table 10. Remote-Sensors Transistor
Manufacturer
Note:
Discrete transistors must be diode connected (base
shorted to collector).
PART
SMBus SLAVE ID
0011 010
0011 100
1001 101
1001 111
0011 010
0011 100
1001 101
1001 111
PIN-PACKAGE
20 QSOP
20 QSOP
20 QSOP
20 QSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
MAX6689EP34
MAX6689EP38
MAX6689EP9A
MAX6689EP9E
MAX6689UP34
MAX6689UP38
MAX6689UP9A
MAX6689UP9E
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