MAX6604ATA+TW【PDF 7/15 页】IC TEMP SENSOR DDR MEMORY 8TDFN

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EVENT-Output Functionality

The EVENT output indicates conditions such as the

temperature crossing a predefined boundary. It oper-

ates in one of the three modes: interrupt mode, com-

parator mode, and critical-temperature-only mode.

Figure 3 shows an example of the measured tempera-

ture vs. time, with the corresponding behavior of the

EVENT output in each of these modes. See the EVENT

Operation Modes section for descriptions of the two

modes. The EVENT modes are selected using the con-

figuration register.

Event-output polarity can be set to active high or active

low through the configuration register (bit 1). The

EVENT output can also be disabled so that EVENT is

always high impedance (bit 3). Upon device power-up,

the default condition for the EVENT output is high

impedance. Writing a 1 to bit 3 of the configuration reg-

ister enables the EVENT output.

EVENT Thresholds

Alarm Window Trip

The MAX6604 provides a comparison window with an

upper-temperature trip point and a lower-temperature

trip point, programmed through the alarm-upper-

boundary register and the alarm-lower-boundary regis-

ter, respectively. When enabled, the EVENT output

triggers whenever entering or exiting (crossing above

or below) the alarm window (Figure 3).

Critical Trip

The critical temperature setting is programmed in the

critical temperature register. When the temperature

reaches the critical temperature value in this register

(and EVENT is enabled), the EVENT output asserts and

cannot be deasserted until the temperature drops

below the critical temperature threshold.

EVENT Operation Modes

Comparator Mode

In comparator mode, the EVENT output behaves like a

window-comparator output that asserts when the tem-

perature is outside the window. Reads/writes on the

MAX6604s registers do not affect the EVENT output in

comparator mode. The EVENT signal remains asserted

until the temperature goes inside the alarm window or

the window thresholds are reprogrammed so that the

current temperature is within the alarm window.

Interrupt Mode

In interrupt mode, EVENT asserts whenever the temper-

ature crosses an alarm window threshold. After such an

event occurs, writing a 1 to the clear event bit in the con-

figuration register deasserts the EVENT output until the

next trigger condition occurs. The trip threshold value in

Precision Temperature Monitor for

DDR Memory Modules

_______________________________________________________________________________________ 7

S/W CLEARS EVENT

EVENT# IN CRITICAL-TEMPERATURE-ONLY MODE

EVENT# IN COMPARATOR MODE

EVENT# IN INTERRUPT

ALARM WINDOW

CRITICAL

TEMP

TIME

Figure 3. EVENT Behavior in Interrupt, Comparator, and Critical-Temperature-Only Modes

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