MCP9808-E-MS Datasheet, PDF (19/52 Pages) Microchip Technology – 0.5°C Maximum Accuracy Digital Temperature Sensor

MCP9808
REGISTER 5-2: CONFIG: CONFIGURATION REGISTER (→ ADDRESS ‘0000 0001’b)
bit 7
Crit. Lock: T_CRIT Lock bit
0 = Unlocked. T_CRIT register can be written (power-up default)
1 = Locked. T_CRIT 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 T_LOWER Window Lock bit
0 = Unlocked; T_UPPER and T_LOWER registers can be written (power-up default)
1 = Locked; T_UPPER and T_LOWER 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
0 = No effect (power-up default)
1 = 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
0 = Alert output is not asserted by the device (power-up default)
1 = 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
0 = Disabled (power-up default)
1 = 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
0 = Alert output for T_UPPER, T_LOWER and T_CRIT (power-up default)
1 = T_A > T_CRIT only (T_UPPER and T_LOWER 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
0 = Active-low (power-up default; pull-up resistor required)
1 = 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
0 = Comparator output (power-up default)
1 = 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.
© 2011 Microchip Technology Inc.
DS25095A-page 19