MCP960X datasheet(36/57 Pages) MICROCHIP

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DS20005426G-page 36

MCP960X/L0X/RL0X

5.2.3

DEVICE CONFIGURATION

The device Configuration register allows the user to

configure

various

functions,

such

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 ISHDN.

During the Shutdown mode, all registers are

accessible; however, I2C 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

temperature 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

applications, where temperature is sampled upon

request from the host controller.

FIGURE 5-7:

Burst Mode Operation.

1←Samples→128

Burst Mode Command

Shutdown Mode

Normal Operation

DEVICE CONFIGURATION REGISTER

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

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