NVT210DMTR2G【PDF 11/20 页】IC TEMP SENSOR DGTL 8-WDFN

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Sheet目录46

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NVT210

http://onsemi.com

The ALERT

interrupt latch is not reset by reading the

status register. It resets when the ALERT

output has been

serviced by the master reading the device address, provided

the error condition has gone away and the status register flag

bits are reset.

When Flag 1 and/or Flag 0 are set, the THERM

output

goes low to indicate that the temperature measurements are

outside the programmed limits. The THERM

output does

not need to be reset, unlike the ALERT

output. Once the

measurements are within the limits, the corresponding status

output

goes high. The user may add hysteresis by programming

output is reset only when the

temperature falls to limit value minus the hysteresis value.

When Pin 6 is configured as THERM2

, only the high

temperature limits are relevant. If Flag 6 and/or Flag 4 are

set, the THERM2

output goes low to indicate that the

temperature measurements are outside the programmed

limits. Flag 5 and Flag 3 have no effect on THERM2

. The

behavior of THERM2

is otherwise the same as THERM

Table 10. STATUS REGISTER BIT ASSIGNMENTS

Bit

Name

Function

BUSY

1 when ADC is Converting

LHIGH

(Note 1)

1 when Local High Temperature Limit is

Tripped

LLOW

(Note 1)

1 when Local Low Temperature Limit is

Tripped

RHIGH

(Note 1)

1 when Remote High Temperature Limit

is Tripped

RLOW

(Note 1)

1 when Remote Low Temperature Limit

is Tripped

OPEN

(Note 1)

1 when Remote Sensor is an Open

Circuit

RTHRM

1 when Remote THERM

Limit is Tripped

LTHRM

1 when Local THERM

Limit is Tripped

1. These flags stay high until the status register is read or they are

reset by POR unless Pin 6 is configured as THERM2

. Then, only

Bit 2 remains high until the status register is read or is reset by

POR.

Offset Register

Offset errors can be introduced into the remote

temperature measurement by clock noise or when the

thermal diode is located away from the hot spot. To achieve

the specified accuracy on this channel, these offsets must be

removed.

The offset value is stored as a 10-bit, twos complement

value in Register 0x11 (high byte) and Register 0x12 (low

byte, left justified). Only the upper two bits of Register 0x12

are used. The MSB of Register 0x11 is the sign bit. The

minimum, programmable offset is 128癈, and the

maximum is +127.75癈. The value in the offset register is

added to, or subtracted from, the measured value of the

remote temperature.

The offset register powers up with a default value of 0癈

and has no effect unless the user writes a different value to

it.

Table 11. SAMPLE OFFSET REGISTER CODES

Offset Value

0x11

0x12

128癈

1000 0000

00 00 0000

4癈

1111 1100

00 00 0000

1癈

1111 1111

00 000000

0.25癈

1111 1111

10 00 0000

0癈

0000 0000

00 00 0000

+0.25癈

0000 0000

01 00 0000

+1癈

0000 0001

00 00 0000

+4癈

0000 0100

00 00 0000

+127.75癈

0111 1111

11 00 0000

One-shot Register

The one-shot register is used to initiate a conversion and

comparison cycle when the NVT210 is in standby mode,

after which the device returns to standby. Writing to the

one-shot register address (0x0F) causes the NVT210 to

perform a conversion and comparison on both the internal

and the external temperature channels. This is not a data

that causes the one-shot conversion. The data written to this

address is irrelevant and is not stored.

Consecutive ALERT

The value written to this register determines how many

out-of-limit measurements must occur before an ALERT

generated. The default value is that one out-of-limit

measurement generates an ALERT

. The maximum value

that can be chosen is 4. The purpose of this register is to

allow the user to perform some filtering of the output. This

is particularly useful at the fastest three conversion rates,

where no averaging takes place. This register is at

Address 0x22.

Table 12. CONSECUTIVE ALERT

Number of Out-of-limit

Measurements Required

yxxx 000x

yxxx 001x

yxxx 011x

yxxx 111x

NOTE: x = dont care bits, and y = SMBus timeout bit.

Default = 0. See SMBus section for more information.

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