DS7505(2015) 查看數據表（PDF） - Maxim Integrated

零件编号

产品描述 (功能)

生产厂家

DS7505
(Rev.:2015)

Digital Thermometer and Thermostat

Maxim Integrated 

DS7505

Digital Thermometer and Thermostat

Operation—Measuring Temperature

The DS7505 measures temperature using a bandgap

temperature-sensing architecture. An on-board delta-

sigma analog-to-digital converter (ADC) converts the

measured temperature to a digital value that is calibrated

in degrees Celsius; for Fahrenheit applications a lookup

table or conversion routine must be used. The DS7505 is

factory-calibrated and requires no external components to

measure temperature.

The DS7505 can be configured to power up either auto-

matically converting temperature or in a low-power standby

state. The preferred power-up mode can be set using the

SD bit in the configuration register as explained in the

Configuration Register section. The resolution of the digital

output data is user-configurable to 9, 10, 11, or 12 bits,

corresponding to temperature increments of 0.5°C, 0.25°C,

0.125°C, and 0.0625°C, respectively. The factory default

resolution at power-up is 9 bits (R1 = 0, R0 = 0), however

this can be programmed to 10, 11, or 12 bits using the R0

and R1 bits in the configuration register as explained in the

Configuration Register section. Note that the conversion

time doubles for each additional bit of resolution.

After each temperature measurement and analog-to-digital

(A/D) conversion, the DS7505 stores the temperature as a

16-bit two’s complement number in the 2-byte temperature

register (see Figure 3). The sign bit (S) indicates if the tem-

perature is positive or negative: for positive numbers S =

0 and for negative numbers S = 1. The most recently con-

verted digital measurement can be read from the tempera-

ture register at any time. Since temperature conversions

are performed in the background, reading the temperature

register does not affect the operation in progress.

Bits 3 through 0 of the temperature register are hardwired

to 0. When the DS7505 is configured for 12-bit resolution,

the 12 MSBs (bits 15 through 4) of the temperature reg-

ister contain temperature data. For 11-bit resolution, the

11 MSBs (bits 15 through 5) of the temperature register

contain data, and bit 4 reads out as 0. Likewise, for 10-bit

resolution, the 10 MSBs (bits 15 through 6) contain data,

and for 9-bit the 9 MSBs (bits 15 through 7) contain data

and all unused LSBs contains 0s. Table 1 gives examples

of 12-bit resolution digital output data and the correspond-

ing temperatures.

MS Byte

LS Byte

Bit 15

S

Bit 7

2-1

Bit 14

26

Bit 6

2-2

Bit 13

25

Bit 5

2-3

Bit 12

24

Bit 4

2-4

Bit 11

23

Bit 3

0

Bit 10

22

Bit 2

0

Figure 3. Temperature, TOS, and THYST Register Format

Table 1. 12-Bit Resolution Temperature/Data Relationship

TEMPERATURE (°C)

+125

+25.0625

+10.125

+0.5

0

-0.5

-10.125

-25.0625

-55

DIGITAL OUTPUT

(BINARY)

0111 1101 0000 0000

0001 1001 0001 0000

0000 1010 0010 0000

0000 0000 1000 0000

0000 0000 0000 0000

1111 1111 1000 0000

1111 0101 1110 0000

1110 0110 1111 0000

1100 1001 0000 0000

Bit 9

21

Bit 1

0

Bit 8

20

Bit 0

0

DIGITAL OUTPUT

(HEX)

7D00

1910

0A20

0080

0000

FF80

F5E0

E6F0

C900

www.maximintegrated.com

Maxim Integrated │  5

Share Link: