MCP9804T-E/MC Microchip Technology, MCP9804T-E/MC Datasheet - Page 16

• Manufacturer Part Number: MCP9804T-E/MC
• Description: IC TEMP SENSOR I2C 2.7V 8DFN
• Manufacturer: Microchip Technology

Specifications of MCP9804T-E/MC

• Package / Case: 8-DFN
• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Temperature Threshold: + 150 C
• Full Temp Accuracy: +/- 0.25 %
• Digital Output - Bus Interface: 2-Wire, I2C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Supply Current: 200 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: MCP9804T-E/MCTR

MCP9804
5.1
The MCP9804 has several registers that are
user-accessible.
Temperature
Temperature
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 it is updated every t
Temperature
Lower-Boundary
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.
REGISTER 5-1:
DS22203B-page 16
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-4
bit 3-0
Note:
W-0
—
Registers
Some registers contain calibration codes and should not be accessed. Accessing these registers could
cause permanent sensor decalibration.
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.
Pointer Bits:
0000 =
0001 =
0010 =
0011 =
0100 =
0101 =
0110 =
0111 =
1000 =
1XXX =
register,
Alert
Alert
Limit
These
W-0
—
REGISTER POINTER (WRITE ONLY)
registers
RFU, reserved for future use (Read Only Register)
Configuration register (CONFIG)
Alert Temperature Upper-Boundary Trip register (T
Alert Temperature Lower-Boundary Trip register (T
Critical Temperature Trip register (T
Temperature register (T
Manufacturer ID register
Device ID/Revision register
Resolution register
RFU (Note)
Upper-Boundary
Upper-Boundary
Configuration
registers
W = Writable bit
‘1’ = Bit is set
W-0
—
are
include
CONV
read/writes
register,
. The
W-0
and
and
A
—
the
)
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
CRIT
The
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’.
describes the pointer or the address of each register.
W-0
)
Configuration
UPPER
LOWER
W-0
Pointer Bits
)
)
register
© 2009 Microchip Technology Inc.
x = Bit is unknown
W-0
provides
Register 5-1
access
W-0
bit 0
to