PCT2202

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© NXP Semiconductors N.V. 2015. All rights reserved.

Product data sheet

Rev. 1.1 — 14 August 2015

11 of 30

NXP Semiconductors

PCT2202

7.3.8 R1, R0 - Converter resolution bits

R1 and R0 are read-only bits. The PCT2202 converter resolution is set on start-up to ‘11’.

This sets the Temperature register to a 12-bit resolution.

7.3.9 OS - One-shot/conversion ready

The PCT2202 features a One-shot temperature measurement mode. When the device is

in Shut-down mode, writing a ‘1’ to the OS bit starts a single temperature conversion.

During the conversion, the OS bit reads ‘0’. The device returns to the shut-down state at

the completion of the single conversion. After the conversion, the OS bit reads ‘1’. This

feature is useful for reducing power consumption in the PCT2202 when continuous

temperature monitoring is not required.

As a result of the short conversion time, the PCT2202 can achieve a higher conversion

rate. A single conversion typically takes 26 ms and a read can take place in less than

20

s. When using One-shot mode, 30 or more conversions per second are possible.

7.4 High-limit and low-limit registers

In Comparator mode (TM = 0), the ALERT pin becomes active when the temperature

according to fault bits F1 and F0. The ALERT pin remains active until the temperature falls

In Interrupt mode (TM = 1), the ALERT pin becomes active when the temperature equals

Table 12). The ALERT pin remains active until a read operation of any register occurs, or

the device successfully responds to the SMBus Alert Response address. The ALERT pin

will also be cleared if the device is placed in Shut-down mode. Once the ALERT pin is

active until cleared by a read operation of any register or a successful response to the

SMBus Alert Response address. Once the ALERT pin is cleared, the above cycle repeats,

ALERT pin can also be cleared by resetting the device with the General Call Reset

command. This action also clears the state of the internal registers in the device, returning

the device to Comparator mode (TM = 0).

Both operational modes are represented in Figure 6. Table 13 and Table 14 describe the

the same as the Temperature register — binary two’s complement format.

Table 12.

PCT2202 fault settings

F1

F0

Consecutive faults

00

1

01

2

10

4

11

6