MAS6505 datasheet(22/44 Pages) MAS

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DA6505.005

11 June 2018

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TEMPERATURE SENSOR CONFRIGURATION REGISTER (FB/7BHEX)

Temperature

sensor

configuration

(FB/7BHEX) is for configuring temperature sensing.

See table 7.

The TSENSOR bit selects between sensor bridge

resistance

temperature

sensing

and

external

temperature sensing diode.

When using the sensor bridge resistance based

temperature sensing (TSENSOR=0) it is necessary

to trim sensor bridge resistance setting by the

RSENSOR bits. There are sixteen sensor bridge

resistance trim values available ranging from 1.89k

Ω

to 9.86k

Ω. These correspond to internal trim resistor

R3 values ranging typically from 10.1k

Ω down to

2.14k

Ω and which are used to balance the formed

temperature sensing bridge circuit. For more details

see chapter SENSOR BRIDGE RESISTANCE

TEMPERATURE SENSING .

When using the external temperature sensing diode

(TSENSOR=1) the external temperature diode is

connected between VDDS pin (diode anode) and TD

(diode

cathode).

During

temperature

measurement the MAS6505 sinks a constant 10 µA

bias current from the temperature sensing diode and

the temperature dependent diode forward voltage is

measured. To avoid signal clipping GAINT=1,

SGNGAINT=1 and OFST%= -28% settings must be

used in external diode temperature measurement.

Note that to select trim data from registers there

must be also set TRIM=01 or 10 in the Trim and

test register (FA/7AHEX). After power up the

default setting is TRIM=00 which selects all trim

data from EEPROM.

The Sensor bridge resistance selection configuration

value need to be stored into Sensor bridge

resistance

selection

data

EEPROM

address

(BB/3BHEX) since by default (TRIM=00) the trimming

value is read from the EEPROM before every

temperature measurement.

See also chapters AFE AND ADC INPUT SIGNAL

RANGE DEFINITIONS, AFE GAIN AND ADC

OFFSET

SELECTIONS,

EXTERNAL

TEMPERATURE

DIODE

TEMPERATURE

SENSING and SENSOR BRIDGE RESISTANCE

TEMPERATURE

SENSING

which

describe

temperature sensing signals and how the GAIN and

OFS settings define the sensor input signal range.

Table 7. Temperature sensor configuration register (FB/7BHEX) description

Bit

Number

Bit Name

Description

Value

Function

7-5

TSENSOR

Temperature sensor selection

Sensor bridge resistance temperature sensing

External temperature sensing diode

3-0

RSENSOR

Sensor bridge resistance trim

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

R3=10110 Ω (Rsensor=1890 Ω)

R3=9890 Ω (Rsensor=2110 Ω)

R3=9644 Ω (Rsensor=2356 Ω)

R3=9370 Ω (Rsensor=2630 Ω)

R3=9064 Ω (Rsensor=2936 Ω)

R3=8722 Ω (Rsensor=3278 Ω)

R3=8340 Ω (Rsensor=3660 Ω)

R3=7914 Ω (Rsensor=4086 Ω)

R3=7438 Ω (Rsensor=4562 Ω)

R3=6907 Ω (Rsensor=5093 Ω)

R3=6314 Ω (Rsensor=5686 Ω)

R3=5652 Ω (Rsensor=6348 Ω)

R3=4912 Ω (Rsensor=7088 Ω)

R3=4087 Ω (Rsensor=7913 Ω)

R3=3166 Ω (Rsensor=8834 Ω)

R3=2137 Ω (Rsensor=9863 Ω)

X = Don’t care

MAS6505 数据表(PDF) 22 Page - Micro Analog systems

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MAS6505 数据表(PDF) 22 Page - Micro Analog systems

MAS6505 数据表(HTML) 22 Page - Micro Analog systems

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