TC77-5.0MOATR【PDF 11/22 页】IC THERMAL SENSOR SPI 5V 8-SOIC

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Sheet目录46

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?2002 Microchip Technology Inc.

DS20092A-page 11

TC77

4.0

INTERNAL REGISTER

STRUCTURE

The TC77 Internal register structure consists of three

registers. The Temperature and Manufacturers Identi-

fication registers are read only, while the Configuration

TABLE 4-1:

REGISTERS FOR TC77

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 1s. 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 0s or all 1s

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 礎 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 twos comple-

ment data from the temperature conversion.

4.3

Manufacturers ID Register (M_ID)

The Manufacturers 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 Manufacturers 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.

Name

Bit

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 1111/1111 0000/0*XX

M_ID

x 0101/0100 0000/00XX

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

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