TC77 查看數據表（PDF） - Microchip Technology

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TC77

Thermal Sensor with SPI Interface

Microchip Technology 

TC77

4.0 INTERNAL REGISTER

STRUCTURE

The TC77 Internal register structure consists of three

registers. The Temperature and Manufacturer’s Identi-

fication registers are read only, while the Configuration

register is write only.

TABLE 4-1: REGISTERS FOR TC77

Name

Bit

15

Bit

14

Bit

13

Bit

12

Bit

11

Bit

10

Bit

9

Bit

8

Bit

7

Bit

6

Bit

5

Bit

4

Bit

3

Bit

2

Bit

1

Bit

0

Value at Powerup/Reset

CONFIG C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0 XXXX/XXXX 0000/0000

TEMP

T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 * x x 1111/1111 0000/0*XX

M_ID

0 1 0 1 0 1 0 0 0 0 0 0 0 0 x x 0101/0100 0000/00XX

* Bit 2 = 0 during power-up; otherwise, bit 2 =1

4.1 Configuration Register (CONFIG)

The Configuration register is write only. This register

selects either Shutdown, Continuous Conversion or

Test modes:

• C15:C0 = XXXX/XXXX 1111/1111 (Shutdown

mode)

• C15:C0 = XXXX/XXXX 0000/0000 (Continuous

Conversion mode)

• The TC77 is in Shutdown mode when bits C0 to

C7 are all equal to ‘1’s. The TC77 will be in the

Continuous Conversion mode if a ‘0’ in any bit

location from C0 to C7 is written to the Configura-

tion register. The TC77 is in the Continuous

Conversion mode at power-up.

It is recommended that the user write all ‘0’s or all ‘1’s

to the Configuration register because other bit codes

may put the TC77 in a test mode used for calibration

and production verification tests. Section 3.3 lists the

Configuration register bit codes that can be written to

the TC77 without having the device enter a production

test mode.

During Shutdown mode, the serial bus is still active.

The current consumption of the TC77 will be less than

1 µA during the time between serial communication.

4.2 Temperature Register (TEMP)

The Temperature register is read only and holds the

temperature conversion data. Bits 0 and 1 are unde-

fined and will be tri-state outputs during a read

sequence. Bit 2 is set to a logic ‘1’ after completion of

the first temperature conversion following a power-up

or reset event. Bit 2 is set to a logic ‘0’ during the time

needed to complete the first temperature conversion.

Therefore, the status of bit 2 can be monitored to indi-

cate that the TC77 has completed the first temperature

conversion. Bits 15:3 contain the 13 bit two’s comple-

ment data from the temperature conversion.

4.3 Manufacturer’s ID Register (M_ID)

The Manufacturer’s Identification code is contained in

this read only register. The Manufacturer ID register is

only available for a read operation when the TC77 is in

Shutdown mode. The Manufacturer’s ID code is con-

tained in bits 15:8 and is equal to 54 hex to indicate a

Microchip device. Bits 1:0 are undefined and will be tri-

state outputs during a read sequence, while bits 7:2 are

set to ‘0’.

 2002-2012 Microchip Technology Inc.

DS20092B-page 11

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