MCP9804 Microchip Technology, MCP9804 Datasheet - Page 19

• Manufacturer Part Number: MCP9804
• Description: Accuracy Digital Temperature Sensor
• Manufacturer: Microchip Technology

REGISTER 5-2:
© 2009 Microchip Technology Inc.
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
T
0 =
1 =
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.
T
0 =
1 =
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.
Interrupt Clear (Int. Clear) Bit:
0 =
1 =
This bit can not be set ‘1’ in shutdown mode, but it can be cleared after the device enters shutdown
mode.
Alert Output Status (Alert Stat.) Bit:
0 =
1 =
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’.
Alert Output Control (Alert Cnt.) Bit:
0 =
1 =
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.
Alert Output Select (Alert Sel.) Bit:
0 =
1 = T
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.
Alert Output Polarity (Alert Pol.) Bit:
0 =
1 =
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.
Alert Output Mode (Alert Mod.) Bit:
0 =
1 =
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.
CRIT
UPPER
CONFIGURATION REGISTER (CONFIG) → ADDRESS
Unlocked. T
Locked. T
Unlocked. T
Locked. T
No effect (power-up default)
Clear interrupt output. When read this bit returns ‘0’
Alert output is not asserted by the device (power-up default)
Alert output is asserted as a comparator/Interrupt or critical temperature output
Disabled (power-up default)
Enabled
Alert output for T
Active low (power-up default. Pull-up resistor required)
Active-high
Comparator output (power-up default)
Interrupt output
Lock Bit (Crit. Lock):
A
and T
> T
CRIT
LOWER
CRIT
UPPER
only. (T
CRIT
UPPER
register can not be written.
Window Lock Bit (Win. Lock):
register can be written (power-up default).
and T
UPPER
UPPER
and T
LOWER
, T
LOWER
and T
LOWER
registers can not be written.
LOWER
registers can be written (power-up default).
and T
temperature boundaries are disabled.)
CRIT
(power-up default)
‘0000 0001’b
MCP9804
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DS22203A-page 19