12-Bit + Sign Temperature Sensor with

SPI-Compatible Serial Interface

4

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0

4

2

8

6

10

12

-50

50

0

100

150

SHUTDOWN CURRENT

VS.

TEMPERATURE

TEMPERATURE (

°C)

Typical Operating Characteristics (continued)

Pin Description

Detailed Description

The MAX6662 continuously converts its die tempera-

ture into a digital value using its integrated ADC.

Temperature data is updated twice a second. The

resulting data is readable at any time through the SPI-

compatible serial interface.

Figure 1 shows the simplified functional diagram of the

MAX6662. Its internal current sources force 100µA and

10µA currents through a diode (diode-connected tran-

sistor), while the integrating ADC measures the voltage

difference. The difference in voltage corresponds to the

die temperature. The result is stored in the Temperature

register. The control logic unit compares the tempera-

ture and the temperature limit settings stored in the reg-

isters to determine whether a fault condition has

occurred.

Temperature Fault Alert

The

ALERT is an open-drain active-low (default, also

programmable active-high) output used to alert the sys-

tem to temperature faults.

ALERT can be programmed

to operate in either one of two modes: comparator or

interrupt mode.

Interrupt Mode

In the interrupt mode, the MAX6662

ALERT pin asserts

fault has occurred, it remains active indefinitely, regard-

less of condition.

ALERT is unconditionally deasserted

(even if Temperature is still out of limits) by reading the

temperature register.

ALERT only asserts again if the

temperature crosses the hysteresis, thereby corre-

the

ALERT.

PIN

NAME

FUNCTION

1

SCLK

Serial-Clock Input

2

CS

Chip Select Input. Set low to enable the serial interface for data input/output.

3

SIO

Serial-Data Input/Output. Bidirectional data input and output for serial interface.

4

GND

Ground

5

OT

6

ALERT

7

NC

No Connection. Do not make a connection to this pin.