MCP9804 datasheet(19/54 Pages) MICROCHIP

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DS22203A-page 19

MCP9804

bit 7

TCRIT Lock Bit (Crit. Lock):

Unlocked. TCRIT register can be written (power-up default).

Locked. TCRIT register can not be written.

When enabled, this bit remains set ‘1’ or locked until cleared by internal reset (

Section 5.3). This bit

does not require a double-write.

This bit can be programmed in shutdown mode.

bit 6

TUPPER and TLOWER Window Lock Bit (Win. Lock):

Unlocked. TUPPER and TLOWER registers can be written (power-up default).

Locked. TUPPER and TLOWER registers can not be written.

When enabled, this bit remains set ‘1’ or locked until cleared by power-on Reset (

Section 5.3). This

bit does not require a double-write.

This bit can be programmed in shutdown mode.

bit 5

Interrupt Clear (Int. Clear) Bit:

No effect (power-up default)

Clear interrupt output. When read this bit returns ‘0’

This bit can not be set ‘1’ in shutdown mode, but it can be cleared after the device enters shutdown

mode.

bit 4

Alert Output Status (Alert Stat.) Bit:

Alert output is not asserted by the device (power-up default)

Alert output is asserted as a comparator/Interrupt or critical temperature output

This bit can not be set ‘1’ or cleared ‘0’ in shutdown mode. However, if the Alert output is configured

as interrupt mode, and if the host controller clears ‘0’ the interrupt using bit 5 while the device is in

shutdown mode then this bit will also be cleared ‘0’.

bit 3

Alert Output Control (Alert Cnt.) Bit:

Disabled (power-up default)

Enabled

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

This bit can be programmed in shutdown mode, but the Alert output will not assert or de-assert.

bit 2

Alert Output Select (Alert Sel.) Bit:

Alert output for TUPPER, TLOWER and TCRIT (power-up default)

TA > TCRIT only. (TUPPER and TLOWER temperature boundaries are disabled.)

When the Alarm Window Lock bit is set, this bit cannot be altered until unlocked (bit 6).

This bit can be programmed in shutdown mode, but the Alert output will not assert or de-assert.

bit 1

Alert Output Polarity (Alert Pol.) Bit:

Active low (power-up default. Pull-up resistor required)

Active-high

This bit cannot be altered when either of the lock bits is set (bit 6 and bit 7).

This bit can be programmed in shutdown mode, but the Alert output will not assert or de-assert.

bit 0

Alert Output Mode (Alert Mod.) Bit:

Comparator output (power-up default)

Interrupt output

This bit cannot be altered when either of the lock bits is set (bit 6 and bit 7).

This bit can be programmed in shutdown mode, but the Alert output will not assert or de-assert.

CONFIGURATION REGISTER (CONFIG)

→ ADDRESS ‘0000 0001’b

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