Datasheet

MCP9600
DS20005426C-page 30  2015-2017 Microchip Technology Inc.
5.2.3 DEVICE CONFIGURATION
REGISTER
The device Configuration register allows the user to con-
figure various functions, such as sensor measurement
resolutions and Power modes. The Resolution register
is used to select the sensor resolution for the desired
temperature conversion time. When resolutions are
changed, the change takes effect when the next
measurement cycle begins.
This device integrates two Low-Power Operating
modes: Shutdown mode and Burst mode, which can be
selected using bit 0 and bit 1. When the Shutdown
mode is executed, all power consuming activities are
disabled and the operating current remains at I
SHDN
.
During the Shutdown mode, all registers are
accessible; however, I
2
C activity on the bus increases
the current.
The Burst mode enables users to execute a given
number of temperature samples (defined by bits<4-2>)
before entering Shutdown mode. Each temperature
sample is compared to the user-settable alert tempera-
ture limits, and if the alert conditions are true, then the
device asserts the corresponding alert output. In
addition, if the filter option is enabled, then the filter
engine is applied to each temperature sample. The alert
thresholds are also compared to the filtered temperature
data. This feature is useful for battery power applica-
tions, where temperature is sampled upon request from
the master controller.
FIGURE 5-7: Burst Mode Operation.
1←Samples→128
Burst Mode Command
Shutdown Mode
Shutdown Mode
Normal Operation
REGISTER 5-8: DEVICE CONFIGURATION REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
Cold-Junction
Resolution
ADC Measurement Resolution Burst Mode Temperature Samples Shutdown Modes
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 Cold-Junction/Ambient Sensor Resolution: Cold-Junction Resolution bit (see Table 5-2):
0 = 0.0625°C
1 = 0.25°C
bit 6-5 ADC Measurement Resolution: ADC Resolution bits (see Table 5-3):
00 = 18-bit Resolution
01 = 16-bit Resolution
10 = 14-bit Resolution
11 =12-bit Resolution
bit 4-2 Burst Mode Temperature Samples: Number of Temperature Samples bits
000 = 1 sample
001 = 2 samples
010 = 4 samples
011 = 8 samples
100 = 16 samples
101 = 32 samples
110 = 64 samples
111 = 128 samples
bit 1-0 Shutdown Modes: Shutdown Mode bits
00 = Normal operation
01 = Shutdown mode
10 = Burst mode
11 = Unimplemented: this setting has no effect