MCP9804-ESLASHMS datasheet(18/54 Pages) MICROCHIP

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MCP9804

DS22203A-page 18

5.1.1

SENSOR CONFIGURATION

The MCP9804 has a 16-bit Configuration register

(CONFIG) that allows the user to set various functions

for a robust temperature monitoring system. Bits 10

thru 0 are used to select 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.

The

Continuous

Conversion

Shutdown mode is selected using bit 8. In Shutdown

mode, the band gap temperature sensor circuit stops

converting temperature and the Ambient Temperature

Section 5.2.1). 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 reseting power. Bits 5 thru 0 are used to configure

the temperature Alert output pin. All functions are

described in Register 5-2 (see

Section 5.2.3).

CONFIGURATION REGISTER (CONFIG)

→ 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

TUPPER and TLOWER Limit Hysteresis (THYST):

= 0°C (power-up default)

= 1.5°C

= 3.0°C

= 6.0°C

(Refer to

Section 5.2.3)

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

Shutdown Mode (SHDN):

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 ‘1’ when either of the lock bits is set (bit 6 and bit 7). However, it can be cleared

‘0’ for Continuous Conversion while locked. (Refer to

Section 5.2.1).

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