MAX1298CEAE+ Maxim Integrated Products, MAX1298CEAE+ Datasheet - Page 17

• Manufacturer Part Number: MAX1298CEAE+
• Description: IC TEMP SENS W/ADC 16-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1298CEAE+

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 85°C, External Sensor
• Output Type: MICROWIRE™, QSPI™, SPI™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Full Temp Accuracy: +/- 1 C
• Digital Output - Bus Interface: Serial (3-Wire)
• Digital Output - Number Of Bits: 12 bit
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 5. Input Selection
*Temperature-measurement mode
Table 6. Remote-Sensor Transistor
Manufacturer
The transistor must be a small-signal type with a base
resistance less than 100Ω. Tight specifications for for-
ward current gain (+50 to +150, for example) indicate
that the manufacturer has good process controls and
that the devices have consistent V
(See Table 6 for recommended devices.)
For heatsink mounting, the 500-32BT02-000 thermal
sensor from Fenwal Electronics is a good choice. This
Central Semiconductor
(USA)
Fairchild Semiconductor
(USA)
Motorola (USA)
Rohm Semiconductor
(Japan)
Siemens (Germany)
Zetex (England)
SEL3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
MANUFACTURER
SEL2
12-Bit Serial-Output Temperature Sensors
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
______________________________________________________________________________________
SEL1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
CMPT3904
MMBT3904
MMBT3904
SST3904
SMB3904
FMMT3904CT-ND
MODEL NUMBER
SEL0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
be
characteristics.
External diode 1 anode* (AIN0)
External diode 2 anode* (AIN2)
POSITIVE INPUT (IN+)
Internal diode anode*
V
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN0
AIN2
DD
—
—
—
—
device consists of a diode-connected transistor, an alu-
minum plate with screw hole, and twisted-pair cable
(Fenwal Inc., Milford MA, 508-478-6000).
For remote-sensor distances greater than 8 inches, or
in particularly noisy environments, use a twisted pair. A
practical length is 6 to 12 feet. For longer distances, the
best solution is a shielded twisted pair such as that
used for audio microphones. For example, the Belden
8451 works well for distances up to 100 feet in a noisy
environment. Connect the shield to SHO.
Cable resistances affect remote-sensor accuracy; 1Ω
series resistance introduces +0.004°C error.
Temperature measurements will reflect significant error
if a portion of the bias current supplied to the diode
anode is allowed to flow through parallel paths to
ground. If the diode-connected transistor is mounted
on a PC board, suppress error-producing “leakage”
current by surrounding the collector/base leads with a
metal trace that is connected to the SHO shield output
(Figure 8).
/4
with 5-Channel ADC
Twisted-Pair and Shielded Cables
Remote Diode Shielding
External diode 1 cathode
External diode 2 cathode
NEGATIVE INPUT (IN-)
Internal diode cathode
(AIN1)
(AIN3)
AIN5
AIN5
AIN5
AIN5
AIN5
AIN5
AIN1
AIN3
GND
—
—
—
—
17