MAX6694TE9A+ Maxim Integrated Products, MAX6694TE9A+ Datasheet - Page 17

• Manufacturer Part Number: MAX6694TE9A+
• Description: IC TEMP MONITOR 5CH 16TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX6694TE9A+

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Buffer, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3) Route the DXP and DXN traces in parallel and in
4) Route through as few vias and crossunders as possi-
5) Use wide traces when practical. 5mil to 10mil traces
6) When the power supply is noisy, add a resistor (up
Use a twisted-pair cable to connect the remote sensor
for remote-sensor distances longer than 8in or in very
noisy environments. Twisted-pair cable lengths can be
between 6ft and 12ft before noise introduces excessive
errors. For longer distances, the best solution is a
shielded twisted pair like that used for audio micro-
phones. For example, Belden #8451 works well for dis-
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 20MΩ 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).
ble to minimize copper/solder thermocouple effects.
are typical. Be aware of the effect of trace resistance on
temperature readings when using long, narrow traces.
to 47Ω) in series with V
Twisted-Pair and Shielded Cables
5-Channel Precision Temperature Monitor
______________________________________________________________________________________
CC
.
with Beta Compensation
tances up to 100ft in a noisy environment. At the
device, connect the twisted pair to DXP and DXN and
the shield to GND. Leave the shield unconnected at the
remote sensor. For very long cable runs, the cable’s
parasitic capacitance often provides noise filtering, so
the 100pF capacitor can often be removed or reduced
in value. Cable resistance also affects remote-sensor
accuracy. For every 1Ω of series resistance, the error is
approximately +0.5°C.
Figure 5. Recommended DXP-DXN PCB Traces. The two outer
guard traces are recommended if high-voltage traces are near
the DXN and DXP traces.
5 mils TO 10 mils
5 mils TO 10 mils
GND
DXN
GND
DXP
5 mils TO 10 mils
MINIMUM
5 mils TO 10 mils
17