MCP9808 datasheet(19/52 Pages) MICROCHIP

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DS25095A-page 19

MCP9808

bit 7

Crit. Lock: T

CRIT Lock bit

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

= Locked. TCRIT register can not be written

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

Section 5.3

“Summary of Power-on Default”).

This bit can be programmed in Shutdown mode.

bit 6

Win. Lock: T

UPPER and TLOWER Window Lock bit

= 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 to ‘1’ or locked until cleared by a Power-on Reset (

Section 5.3

“Summary of Power-on Default”).

This bit can be programmed in Shutdown mode.

bit 5

Int. Clear: Interrupt Clear bit

= No effect (power-up default)

= Clear interrupt output; when read, this bit returns to ‘0’

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

mode.

bit 4

Alert Stat.: Alert Output Status 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 to ‘1’ or cleared to ‘0’ in Shutdown mode. However, if the Alert output is config-

ured as Interrupt mode, and if the host controller clears to ‘0’, the interrupt, using bit 5 while the device

is in Shutdown mode, then this bit will also be cleared ‘0’.

bit 3

Alert Cnt.: Alert Output Control bit

= Disabled (power-up default)

= Enabled

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, but the Alert output will not assert or deassert.

bit 2

Alert Sel.: Alert Output Select 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 deassert.

bit 1

Alert Pol.: Alert Output Polarity bit

= Active-low (power-up default; pull-up resistor required)

= Active-high

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

This bit can be programmed in Shutdown mode, but the Alert output will not assert or deassert.

bit 0

Alert Mod.: Alert Output Mode bit

= Comparator output (power-up default)

= Interrupt output

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

This bit can be programmed in Shutdown mode, but the Alert output will not assert or deassert.

CONFIG: CONFIGURATION REGISTER (

→ ADDRESS ‘0000 0001’b)

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