Datasheet

© 2009 Microchip Technology Inc. DS22153C-page 31
MCP9843/98243
5.1.7 RESOLUTION REGISTER
This register allows the user to change the sensor
resolution (see Section 5.2.4 “Temperature
Resolution”). The POR default resolution is 0.25°C.
The selected resolution is also reflected in the
Capability register (see Register 5-2).
FIGURE 5-9: Timing Diagram for Changing T
A
Resolution to 0.0625°C <0000 0011>b (See
Section 4.0 “Serial Communication”).
REGISTER 5-9: RESOLUTION → ADDRESS
‘0000 1000’b
U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0
— — — — — — 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:
00 = LSB = 0.5°C (t
CONV
= 30 ms typical)
01 = LSB = 0.25°C (power up default, t
CONV
= 65 ms typical)
10 = LSB = 0.125°C (t
CONV
= 130 ms typical)
11 = LSB = 0.0625°C (t
CONV
= 260 ms typical)
SDA
A
C
K
0011
A
A
C
K
S
2
A
1
A
0
12345678 12345678
SCL
Address Byte
W
MCP9843/98243
MCP9843/98243
A
C
K
P
12345678
Data
Resolution Pointer
MCP9843/98243
00001
000 00000
011