TMP106 datasheet(7/20 Pages) TI2

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TMP106

SLLS672A − OCTOBER 2005 − REVISED JANUARY 2006

www.ti.com

CONVERTER RESOLUTION (R1/R0)

The Converter Resolution bits control the resolution of the

internal analog-to-digital (A/D) converter. This control

allows the user to maximize efficiency by programming for

higher resolution or faster conversion time. Table 8

identifies the resolution bits and the relationship between

resolution and conversion time.

RESOLUTION

CONVERSION TIME

(typical)

9 Bits (0.5

°C)

27.5ms

10 Bits (0.25

°C)

55ms

11 Bits (0.125

°C)

110ms

12 Bits (0.0625

°C)

220ms

Table 8. Resolution of the TMP106

ONE-SHOT (OS)

The

TMP106

features

One-Shot

Temperature

Measurement Mode. When the device is in Shutdown

Mode, writing a ‘1’ to the OS bit starts a single temperature

conversion. The device will return to the shutdown state at

the completion of the single conversion. This option is

useful to reduce power consumption in the TMP106 when

continuous temperature monitoring is not required. When

the Configuration Register is read, the OS always reads

zero.

HIGH AND LOW LIMIT REGISTERS

In Comparator Mode (TM = 0), the ALERT pin of the

TMP106 becomes active when the temperature equals or

exceeds the value in THIGH and generates a consecutive

number of faults according to fault bits F1 and F0. The

ALERT pin remains active until the temperature falls below

the indicated TLOW value for the same number of faults.

In Interrupt Mode (TM = 1), the ALERT pin becomes active

when the temperature equals or exceeds THIGH for a

consecutive number of fault conditions. The ALERT pin

remains active until a read operation of any register

occurs, or until the device successfully responds to the

SMBus Alert Response address. The ALERT pin clears if

the device is placed in Shutdown Mode. Once the ALERT

pin is cleared, it will only become active again by the

temperature falling below TLOW. When the temperature

falls below TLOW, the ALERT pin becomes active and

remains active until cleared by a read operation of any

Response address. When the ALERT pin clears, the

above cycle will repeat, with the ALERT pin becoming

active when the temperature equals or exceeds THIGH.

The ALERT pin can also be cleared by resetting the device

with the General Call Reset command. This reset 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 3.

Table 9 and Table 10 describe the format for the THIGH and

TLOW Registers. Note that the most significant byte is sent

first, followed by the least significant byte. Power-up reset

values for THIGH and TLOW are:

THIGH = 80°C and TLOW = 75°C

The format of the data for THIGH and TLOW is the same as

for the Temperature Register.

BYTE

H11

H10

BYTE

Table 9. Bytes 1 and 2 of THIGH Register

BYTE

L11

L10

BYTE

Table 10. Bytes 1 and 2 of TLOW Register

All 12 bits for the Temperature, THIGH, and TLOW Registers

are used in the comparisons for the ALERT function for all

converter resolutions. The three LSBs in THIGH and TLOW

can affect the ALERT output even if the converter is

configured for 9-bit resolution.

SERIAL INTERFACE

The TMP106 operates only as a slave device on the

Two-Wire bus and SMBus. Connections to the bus are

made via the open-drain I/O lines SDA and SCL. The SDA

and SCL pins feature integrated spike suppression filters

and Schmitt triggers to minimize the effects of input spikes

and bus noise. The TMP106 supports the transmission

protocol for fast (1kHz to 400kHz) and high-speed (1kHz

to 3.4MHz) modes. All data bytes are transmitted MSB

first.

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