MPF7100BVMA2ES datasheet(86/125 Pages) NXP

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NXP Semiconductors

PF7100

7-channel power management integrated circuit for high performance applications

PF7100

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Product data sheet

Rev. 4 — 9 March 2021

86 / 125

Symbol

Parameter[1]

Min

Typ

Max

Unit

t_temp_db

Debounce timer for temperature thresholds

(bidirectional)

—

µs

tSinterval

Sampling interval time

When TMP_MON_AON = 1

—

3.0

—

tSwindow

Sampling window

When TMP_MON_AON = 1

—

450

—

µs

[1]

Sensor temperature is calculated with the following formula: T [°C] = (VTSENSE – 1.498 V) / TCOF, where VTSENSE is the thermal sensor voltage measured

on the corresponding AMUX channel.

aaa-028071

1.2

1.4

1.0

1.6

1.8

Tsense

voltage

(V)

0.8

die temperature (°C)

-40

160

120

200

Figure 35. Thermal sensor voltage characteristics

As the temperature crosses the thermal thresholds, the corresponding interrupts are

set to notify the system. The processor may take appropriate action to bring down the

temperature (either by turning off external regulators, reducing load, or turning on a fan).

A 5 ºC hysteresis is implemented on a falling temperature in order to release the

corresponding THERM_x_S signal. When the shutdown threshold is crossed, the

PF7100 initiates a thermal shutdown and it prevents from turning back on until the 15 ºC

thermal shutdown hysteresis is crossed as the device cools down.

The temperature monitor can be enabled or disabled via I2C with the TMP_MON_EN bit.

• When TMP_MON_EN = 0, the temperature monitor circuit is disabled.

• When TMP_MON_EN = 1, the temperature monitor circuit is enabled.

In the run state, the temperature sensor can operate in always on or sampling modes.

• When the TMP_MON_AON = 1, the device is always on during the run mode.

• When the TMP_MON_AON = 0, the device operates in sampling mode to reduce

current consumption in the system. In sampling mode, the thermal monitor is turned on

during 450 µs at a 3.0 ms sampling interval.

In the standby mode, the thermal monitor operates only in sampling mode as long as the

TMP_MON_EN = 1

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