NCT214MT3R2G【PDF 9/19 页】IC TEMP SENSOR LOC/REM 10WDFN

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Sheet目录45

5页 6页 7页 8页 [9页]10页 11页 12页 13页

NCT214

http://onsemi.com

Table 7. TEMPERATURE DATA FORMAT

(TEMPERATURE HIGH BYTE)

Temperature

Binary

Offset Binary

(Note 1)

55癈

0 000 0000

(Note 2)

0 000 1001

0癈

0 000 0000

0 100 0000

+1癈

0 000 0001

0 100 0001

+10癈

0 000 1010

0 100 1010

+25癈

0 001 1001

0 101 1001

+50癈

0 011 0010

0 111 0010

+75癈

0 100 1011

1 000 1011

+100癈

0 110 0100

1 010 0100

+125癈

0 111 1101

1 011 1101

+127癈

0 111 1111

1 011 1111

+150癈

0 111 1111

(Note 3)

1 101 0110

1. Offset binary scale temperature values are offset by 64癈.

2. Binary scale temperature measurement returns 0癈 for all

temperatures < 0癈.

3. Binary scale temperature measurement returns 127癈 for all

temperatures > 127癈.

The user can switch between measurement ranges at any

time. Switching the range likewise switches the data format.

The next temperature result following the switching is

reported back to the register in the new format. However, the

contents of the limit registers do not change. It is up to the

user to ensure that when the data format changes, the limit

registers are reprogrammed as necessary. More information

on this is found in the Limit Registers section.

NCT214 Registers

The NCT214 contains 22, 8-bit registers in total. These

registers store the results of remote and local temperature

measurements, high and low temperature limits, and

configure and control the device. See the Address Pointer

section of this data sheet for more information on the

NCT214 registers. Additional details are shown in Table 8

through Table 12. The entire register map is available in

Table 13.

Address Pointer Register

The address pointer register itself does not have, nor does

it require, an address because the first byte of every write

operation is automatically written to this register. The data

in this first byte always contains the address of another

a write operation is written, or to which a subsequent read

operation is performed.

The power-on default value of the address pointer register

is 0x00. Therefore, if a read operation is performed

immediately after power-on, without first writing to the

address pointer, the value of the local temperature is returned

because its register address is 0x00.

Temperature Value Registers

The NCT214 has three registers to store the results of local

and remote temperature measurements. These registers can

only be written to by the ADC and can be read by the user

over the SMBus/I

C. The local temperature value register is

at Address 0x00.

The external temperature value high byte register is at

Address 0x01, with the low byte register at Address 0x10.

The power-on default for all three registers is 0x00.

Configuration Register

The configuration register is Address 0x03 at read and

Address 0x09 at write. Its power-on default is 0x00. Only

four bits of the configuration register are used. Bit 0, Bit 1,

Bit 3, and Bit 4 are reserved; the user does not write to them.

Bit 7 of the configuration register masks the ALERT

output. If Bit 7 is 0, the ALERT

output is enabled. This is the

power-on default. If Bit 7 is set to 1, the ALERT

output is

disabled. This applies only if Pin 6 is configured as ALERT

If Pin 6 is configured as THERM2

, then the value of Bit 7

has no effect.

If Bit 6 is set to 0, which is power-on default, the device

is in operating mode with ADC converting. If Bit 6 is set to

1, the device is in standby mode and the ADC does not

convert. The SMBus does, however, remain active in

standby mode; therefore, values can be read from or written

to the NCT214 via the SMBus. The ALERT

and THERM

outputs are also active in standby mode. Changes made to

the registers in standby mode that affect the THERM

ALERT

outputs cause these signals to be updated.

Bit 5 determines the configuration of Pin 6 on the

NCT214. If Bit 5 is 0 (default), then Pin 6 is configured as

an ALERT

output. If Bit 5 is 1, then Pin 6 is configured as

a THERM2

output. Bit 7, the ALERT

mask bit, is only

active when Pin 6 is configured as an ALERT

output. If

Pin 6 is set up as a THERM2

output, then Bit 7 has no effect.

Bit 2 sets the temperature measurement range. If Bit 2 is

0 (default value), the temperature measurement range is set

between 0癈 to +127癈. Setting Bit 2 to 1 sets the

measurement range to the extended temperature range

(64癈 to +191癈).

Table 8. CONFIGURATION REGISTER BIT

ASSIGNMENTS

Bit

Name

Function

Power-On

Default

MASK1

0 = ALERT

Enabled

1 = ALERT

Masked

RUN/STOP

0 = Run

1 = Standby

ALERT

THERM2

0 = ALERT

1 = THERM2

4, 3

Reserved

Temperature

Range Select

0 = 0癈 to 127癈

1 = Extended Range

1, 0

Reserved

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