TB(P) Series Specification

Non-contact Infrared Temperature Sensor

Page

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1.0.0

- code example read Object temperature 0x07

0. power on & wait for sensor initialization(≥200ms)

1. Send START bit

2. Send 0x74 : [Slave Address(0x3A by default) + Wr(0)]

3. ACK from Slave

4. Send Command : 0x07 (Object) [ Ambient: 0x06 ]

5. ACK from Slave

6. Send repeated Start

7. Send 0x75 : [Slave Address(0x3A) + Rd(1)]

8. ACK from slave

9. Read Data Byte Low (Send ACK)

10. Read Data Byte High (Send ACK)

11. Read PEC (Send ACK or NACK)

12. Send Stop bit

13. Wait >100ms & repeat 1…13

Object Temperature To

To is the object temperature derived from thermopile and ambient sensor outputs

as absolute (Kelvin) temperature

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°K = ������ ������������������ × 0.02

Please note that 1LSB corresponds to 0.02°C and the MSB bit is error flag (if “1” then

error). Maximum register value is 0x7FFF - maximum possible value returned by TB(P)

The result is calculated by following expressions (valid for both To and Ta):

1. Convert it to decimal value i.e. 0x3B99 = 15,257d

2. Multiply by 0.02(or divide by 50) i.e. 15,257 ⅹ 0.02 = 305.14°K (result in Kelvin)

3. Convert K → ℃ i.e. 305.14 - 273.15 = 31.99℃

Ambient Temperature Ta

The Sensor die temperature is measured with a PTAT element. All the sensors

conditioning and data processing is handled on-chip.

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°K = ������ ������������������ × 0.02

Maximum register value is 0x7FFF.

Output Limit: 0x2DE4(-38.19℃) ... 0x4DC4(125.01℃)

Emissivity Correction Coefficient

The TB(P) is calibrated for an object emissivity of 0.97. It can be easily customized

by the customer for any other emissivity in the range 0.1…1.0.

Factory default 0.97 = 63,568(0xF850)

(0.97 *65536) - 1 = 63568.92 round down → 63568

Max 1.00 = 65535(0xFFFF)

Write Word

1

7

1

1

8

1

S

Slave Address

Wr

A

Command Address

A

∙∙∙

8

1

8

1

8

1

1

∙∙∙

Data Byte

Low

A

Data Byte

High

A

PEC

A

P

Before changing of cell contents the respective cells need to be erased. Erasing is a

writing of zeros to the respective Command Address. After writing operation the

device needs 5ms to process the new values. After changing the "Command

Address" cell contents, it is strongly recommended to restart the sensor by power

off/on.

- Write operation flow diagram

- code example write Slave Address 0x2E

Erasing:

1. Send START bit

2. Send 0x74 : [Slave Address(0x3A by default) + Wr(0)]

3. Send Command : 0x2E

4. Send Data Byte Low : 0x00 (for erasing)

5. Send Data Byte High : 0x00 (for erasing)

6. Send PEC : 0x05 (calculated CRC value)

7. Send STOP bit

8. Wait 5ms

Writing : (Slave Address 0x3A → 0x4C)

9. Send START bit

10. Send 0x74 : [Slave Address(0x3A by default) + Wr(0)]

11. Send Command : 0x2E

12. Send Data Byte Low : 0x4C

13. Send Data Byte High : 0x00

14. Send PEC : 0xA2 (calculated CRC value)

15. Send STOP bit

16. Wait 5ms

17. Reset of the sensor (power off/ on)

- code example write Emissivity correction coefficient Address 0x24

Erasing:

1. Send START bit

2. Send 0x74 : [Slave Address(0x3A by default) + Wr(0)]

3. Send Command : 0x24

4. Send Data Byte Low : 0x00 (for erasing)

5. Send Data Byte High : 0x00 (for erasing)

6. Send PEC : 0x05 (calculated CRC value)

7. Send STOP bit

8. Wait 5ms

Writing : (coefficient → 0xF850)

9. Send START bit

10. Send 0x74 : [Slave Address(0x3A by default) + Wr(0)]

11. Send Command : 0x24

12. Send Data Byte Low : 0x50

13. Send Data Byte High : 0xF8

14. Send PEC : 0x68 (calculated CRC value)

15. Send STOP bit

16. Wait 5ms

17. Reset of the sensor (power off/ on)