MCP9804-ESLASHMS datasheet(16/54 Pages) MICROCHIP

16 / 54 page

MCP9804

DS22203A-page 16

5.1

Registers

The

MCP9804

has

several

registers

that

are

user-accessible.

These

registers

include

the

Temperature

Configuration

Temperature

Alert

Upper-Boundary

and

Lower-Boundary Limit registers, Critical Temperature

Limit register, Manufacturer Identification register and

Device Identification register.

The Temperature register is read-only, used to access

the ambient temperature data. This register is double

buffered

and

updated

every

tCONV. The

Temperature

Alert

Upper-Boundary

and

Lower-Boundary

Limit

registers

are

read/writes

registers. If the ambient temperature drifts beyond the

user-specified limits, the MCP9804 outputs a signal

using the Alert pin (refer to

Section 5.2.3). In addition,

the Critical Temperature Limit register is used to

provide an additional critical temperature limit.

The

Configuration

provides

access

configure the MCP9804’s various features. These

registers are described in further detail in the following

sections.

The registers are accessed by sending a Register

Pointer to the MCP9804 using the serial interface. This

is an 8-bit write-only pointer. However, the four Least

Significant bits are used as pointers and all unused bits

(bits 7-3) need to be cleared or set to ‘0’. Register 5-1

describes the pointer or the address of each register.

W-0

——

—

Pointer Bits

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-4

Writable Bits: Write ‘0’

Bits 7-4 must always be cleared or written to ‘0’. This device has additional registers that are reserved

for test and calibration. If these registers are accessed, the device may not perform according to the

specification.

bit 3-0

Pointer Bits:

0000

RFU, reserved for future use (Read Only Register)

0001

Configuration register (CONFIG)

0010

Alert Temperature Upper-Boundary Trip register (TUPPER)

0011

Alert Temperature Lower-Boundary Trip register (TLOWER)

0100

Critical Temperature Trip register (TCRIT)

0101

Temperature register (TA)

0110

Manufacturer ID register

0111

Device ID/Revision register

1000

Resolution register

1XXX

=RFU (

Note)

Note:

Some registers contain calibration codes and should not be accessed. Accessing these registers could

cause permanent sensor decalibration.

MCP9804-E/MS 数据表(PDF) 16 Page - Microchip Technology

MCP9804-E/MS 数据表(HTML) 16 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

数据表下载

链接网址

MCP9804-E/MS 数据表(PDF) 16 Page - Microchip Technology

MCP9804-E/MS 数据表(HTML) 16 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

数据表 下载

链接网址

数据表下载