MCP9843 datasheet(21/62 Pages) MICROCHIP

21 / 62 page

DS22153C-page 21

MCP9843/98243

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 5.4 “Summary

of Power-on Default”). 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 Respell (Section 5.4 “Sum-

mary of Power-on Default”). 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 clears the Interrupt flag which de-asserts Event output. In shutdown mode, the Event output is

always de-asserted. Therefore, setting this bit in shutdown mode clears the interrupt after the device

returns to normal operation.

bit 4

Event Output Status (Event Stat.) Bit:

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

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

In shutdown mode this bit will clear because Event output is always de-asserted in shutdown mode.

bit 3

Event Output Control (Event Cnt.) Bit:

Event output Disabled (power-up default)

Event output 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 Event output will remain de-asserted.

bit 2

Event Output Select (Event Sel.) Bit:

Event 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 Event output will remain de-asserted.

bit 1

Event Output Polarity (Event Pol.) Bit:

Active low (power-up default. Pull-up resistor required) See Section 5.2.3 “Event Output

Configuration”

Active-high (Pull-down resistor required) See Section 5.2.3 “Event Output Configuration”

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 Event output will remain de-asserted.

bit 0

Event Output Mode (Event 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 Event output will remain de-asserted.

CONFIGURATION REGISTER (CONFIG)

→ ADDRESS ‘0000 0001’b

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