MAX6699EE99+ Maxim Integrated Products, MAX6699EE99+ Datasheet - Page 16

• Manufacturer Part Number: MAX6699EE99+
• Description: IC TEMP MONITOR 5CH 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6699EE99+

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Buffer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 11 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
Table 11 shows the MAX6699 slave address.
Follow these guidelines to reduce the measurement
error when measuring remote temperature:
1) Place the MAX6699 as close as is practical to the
5-Channel Precision Temperature Monitor
Table 10. Remote-Sensors Transistor
Manufacturers
Note: Discrete transistors must be diode connected (base
shorted to collector).
Table 11. Slave Address
16
Central Semiconductor (USA)
Rohm Semiconductor (USA)
Samsung (Korea)
Siemens (Germany)
Zetex (England)
MAX6699EE34
MAX6699EE38
MAX6699EE99
MAX6699EE9C
MAX6699UE34
MAX6699UE38
MAX6699UE99
MAX6699UE9C
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
______________________________________________________________________________________
PART
MANUFACTURER
SMBus SLAVE ID
0011 010
0011 100
1001 100
1001 110
0011 010
0011 100
1001 100
1001 110
ADC Noise Filtering
CMPT3904
SST3904
KST3904-TF
SMBT3904
FMMT3904CT-ND
Slave Address
MODEL NO.
PIN-PACKAGE
PCB Layout
16 TSSOP
16 TSSOP
16 TSSOP
16 TSSOP
16 QSOP
16 QSOP
16 QSOP
16 QSOP
2) Do not route the DXP-DXN lines next to the deflec-
3) Route the DXP and DXN traces in parallel and in
4) Route through as few vias and crossunders as pos-
5) Use wide traces when practical.
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-
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
Figure 5. Recommended Minimum DXP-DXN PCB Traces
5 mils
5 mils
noise sources are avoided. Noise sources include
CRTs, clock generators, memory buses, and PCI
buses.
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.
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).
sible to minimize copper/solder thermocouple
effects.
to 47Ω) in series with V
Twisted-Pair and Shielded Cables
GND
DXP
DXN
GND
CC
.
5 mils
MINIMUM
5 mils