Microchip Technology TMPSNSRD-TCPL1 データシート
© 2009-2012 Microchip Technology Inc.
DS22203C-page 29
MCP9804
5.1.6
RESOLUTION REGISTER
This register allows the user to change the sensor
resolution (see
resolution (see
). The POR default resolution is
FIGURE 5-8:
Timing Diagram for Changing T
A
Resolution to +0.0625°C <0000 0011>b (see
REGISTER 5-7:
RESOLUTION REGISTER (
→ ADDRESS ‘0000 1000’b)
U-0
U-0
U-0
U-0
U-0
U-0
R/W-1
R/W-1
—
—
—
—
—
—
Resolution
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 7-2
Unimplemented: Read as ‘0’
bit 1-0
Resolution bits
00
= LSB = +0.5°C (t
CONV
= 30 ms typical)
01
= LSB = +0.25°C (t
CONV
= 65 ms typical)
10
= LSB = +0.125°C (t
CONV
= 130 ms typical)
11
= LSB = +0.0625°C (power-up default, t
CONV
= 250 ms typical)
SDA
A
C
K
0
0
1
1
A
A
C
K
S
2
A
1
A
0
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCL
Address Byte
W
MCP9804
MCP9804
A
C
K
P
1
2
3
4
5
6
7
8
Data
Resolution Pointer
MCP9804
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
1