MAX6627MKA-T Maxim Integrated Products, MAX6627MKA-T Datasheet - Page 6

• Manufacturer Part Number: MAX6627MKA-T
• Description: IC, TEMP SENSOR, 12BIT, ± 1°C, 8-SOT-23
• Manufacturer: Maxim Integrated Products

Specifications of MAX6627MKA-T

• Ic Output Type: Digital
• Sensing Accuracy Range: ± 1°C
• Supply Current: 200µA
• Supply Voltage Range: 3V To 5.5V
• Resolution (bits): 12bit
• Sensor Case Style: SOT-23
• No. Of Pins: 8
• Full Temp Accuracy: +/- 0.5 C
• Package / Case: SOT-23
• Digital Output - Bus Interface: Serial (3-Wire, SPI)
• Digital Output - Number Of Bits: 12 bit + Sign
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Output Type: Digital
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 2. Temperature Data Format
(Two’s Complement)
Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
Figure 2. SPI Timing Diagram
0°C. When power is first applied and V
1.6V (typ), the device starts to convert, although tem-
perature reading is not recommended at V
below 3.0V.
Figure 2 is the serial interface timing diagram. The data
is latched into the shift register on the falling edge of
the CS signal and then clocked out at the SDO pin on
the falling edge of SCK with the most-significant bit
(MSB) first. There are 16 edges of data per frame. The
last 2 bits, D0 and D1, are always in high-impedance
mode. The falling edge of CS stops any conversion in
progress, and the rising edge of CS always starts a
new conversion and resets the interface. It is required
to maintain a 320ms minimum pulse width of high CS
signal before a conversion starts.
Temperature accuracy depends upon having a good-
quality, diode-connected, small-signal transistor.
6
TEMPERATURE
_______________________________________________________________________________________
-0.0625
0.0625
(°C)
150
125
-25
-55
25
0
SDO
SCK
CS
t
DV
Applications Information
0,1001,0110,0000
0,0111,1101,0000
0,0001,1001,0000
0,0000,0000,0001
0,0000,0000,0000
1,1111,1111,1111
1,1110,0111,0000
1,1100,1001,0000
D15
DIGITAL OUTPUT (BINARY)
D15–D3
Remote-Diode Selection
t
CSS
Serial Interface
CC
D2
0
0
0
0
0
0
0
0
rises above
t
DO
CC
D1, D0
levels
XX
XX
XX
XX
XX
XX
XX
XX
Table 3. SOT23-Type Remote-Sensor
Transistor Manufacturers
Accuracy has been experimentally verified for all of the
devices listed in Table 3. The MAX6627/MAX6628 can
also directly measure the die temperature of CPUs and
other ICs with on-board temperature-sensing diodes.
The transistor must be a small-signal type with a rela-
tively high forward voltage. This ensures that the input
voltage is within the A/D input voltage range. The for-
ward voltage must be greater than 0.25V at 10µA at the
highest expected temperature. The forward voltage
must be less than 0.95V at 100µA at the lowest expect-
ed temperature. The base resistance has to be less
than 100Ω. Tight specification of forward-current gain
(+50 to +150, for example) indicates that the manufac-
turer has good process control and that the devices
have consistent characteristics.
The integrating ADC has inherently good noise rejec-
tion, especially of low-frequency signals such as
60Hz/120Hz power-supply hum. Micropower operation
places constraints on high-frequency noise rejection.
Lay out the PCB carefully with proper external noise fil-
tering for high-accuracy remote measurements in elec-
trically noisy environments.
Note: Transistors must be diode connected (short the base to
the collector).
Central Semiconductor (USA)
Motorola (USA)
Rohm Semiconductor (Japan)
Siemens (Germany)
Zetex (England)
MANUFACTURER
D3
D2
D1
t
TR
ADC Noise Filtering
D0
FMMT3904CT-ND
MMBT3904
CMPT3904
SMBT3904
SST3904
MODEL