MCP9808 datasheet(18/52 Pages) MICROCHIP

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MCP9808

DS25095A-page 18

5.1.1

SENSOR CONFIGURATION

The MCP9808 has a 16-bit Configuration register

(CONFIG) that allows the user to set various functions for

a robust temperature monitoring system. Bits 10 through

0 are used to select the temperature alert output

hysteresis, device shutdown or Low-Power mode,

temperature boundary and critical temperature lock, and

temperature Alert output enable/disable. In addition, Alert

output condition (output set for TUPPER and TLOWER

temperature boundary or TCRIT only), Alert output status

and Alert output polarity and mode (Comparator Output

or Interrupt Output mode) are user-configurable.

The temperature hysteresis bits 10 and 9 can be used

prevent

output

chatter

when

the

ambient

temperature

gradually

changes

beyond

the

user-specified

temperature

boundary

(see

Section 5.2.2 “Temperature Hysteresis (THYST)”.

The Continuous Conversion or Shutdown mode is

selected using bit 8. In Shutdown mode, the band gap

temperature

sensor

circuit

stops

converting

temperature and the Ambient Temperature register

(TA) holds the previous temperature data (see

Section 5.2.1 “Shutdown Mode”). Bits 7 and 6 are

used to lock the user-specified boundaries TUPPER,

TLOWER and TCRIT to prevent an accidental rewrite.

The Lock bits are cleared by resetting the power. Bits 5

through 0 are used to configure the temperature Alert

output pin. All functions are described in Register 5-2

(see

Section 5.2.3 “Alert Output Configuration”).

CONFIG: CONFIGURATION REGISTER (

→ ADDRESS ‘0000 0001’b)

U-0

R/W-0

—

—THYST

SHDN

bit 15

bit 8

R/W-0

R-0

R/W-0

Crit. Lock

Win. Lock

Int. Clear

Alert Stat.

Alert Cnt.

Alert Sel.

Alert Pol.

Alert Mod.

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 15-11

Unimplemented: Read as ‘0’

bit 10-9

THYST: TUPPER and TLOWER Limit Hysteresis bits

= 0°C (power-up default)

=+1.5°C

=+3.0°C

=+6.0°C

(Refer to

Section 5.2.3 “Alert Output Configuration”.)

This bit can not be altered when either of the Lock bits are set (bit 6 and bit 7).

This bit can be programmed in Shutdown mode.

bit 8

SHDN: Shutdown Mode bit

= Continuous conversion (power-up default)

= Shutdown (Low-Power mode)

In shutdown, all power-consuming activities are disabled, though all registers can be written to or read.

This bit cannot be set to ‘1’ when either of the Lock bits is set (bit 6 and bit 7). However, it can be

cleared to ‘0’ for continuous conversion while locked (refer to

Section 5.2.1 “Shutdown Mode”).

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