MCP9808 MICROCHIP [Microchip Technology], MCP9808 Datasheet - Page 18

• Manufacturer Part Number: MCP9808
• Manufacturer: MICROCHIP [Microchip Technology]

temperature boundary and critical temperature lock, and
MCP9808
5.1.1
The MCP9808 has a 16-bit Configuration register
(CONFIG) that allows the user to set various functions for
a robust temperature monitoring system. Bits 10 through
0 are used to select the temperature alert output
hysteresis, device shutdown or Low-Power mode,
temperature Alert output enable/disable. In addition, Alert
output condition (output set for T
temperature boundary or T
and Alert output polarity and mode (Comparator Output
or Interrupt Output mode) are user-configurable.
The temperature hysteresis bits 10 and 9 can be used
to
temperature
REGISTER 5-2:
DS25095A-page 18
bit 15
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 15-11
bit 10-9
bit 8
Crit. Lock
prevent
R/W-0
U-0
—
SENSOR CONFIGURATION
REGISTER (CONFIG)
output
gradually
Unimplemented: Read as ‘0’
T
00 = 0°C (power-up default)
01 = +1.5°C
10 = +3.0°C
11 = +6.0°C
(Refer to
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.
SHDN: Shutdown Mode bit
0 = Continuous conversion (power-up default)
1 = Shutdown (Low-Power mode)
In shutdown, all power-consuming activities are disabled, though all registers can be written to or read.
This bit cannot be set to ‘1’ when either of the Lock bits is set (bit 6 and bit 7). However, it can be
cleared to ‘0’ for continuous conversion while locked (refer to
HYST
Win. Lock
R/W-0
U-0
—
: T
CONFIG: CONFIGURATION REGISTER (→ ADDRESS ‘0000 0001’b)
chatter
UPPER
Section 5.2.3 “Alert Output
CRIT
changes
only), Alert output status
W = Writable bit
‘1’ = Bit is set
and T
when
Int. Clear
UPPER
R/W-0
U-0
—
LOWER
beyond
the
and T
Limit Hysteresis bits
ambient
Alert Stat.
LOWER
U-0
R-0
—
the
Configuration”.)
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
Alert Cnt.
R/W-0
user-specified
Section 5.2.2 “Temperature Hysteresis (T
The Continuous Conversion or Shutdown mode is
selected using bit 8. In Shutdown mode, the band gap
temperature
temperature and the Ambient Temperature register
(T
Section 5.2.1 “Shutdown
used to lock the user-specified boundaries T
T
The Lock bits are cleared by resetting the power. Bits 5
through 0 are used to configure the temperature Alert
output pin. All functions are described in
(see
U-0
LOWER
—
A
) holds the previous temperature data (see
Section 5.2.3 “Alert Output
and T
Alert Sel.
R/W-0
R/W-0
Section 5.2.1 “Shutdown
CRIT
sensor
temperature
to prevent an accidental rewrite.
T
HYST
© 2011 Microchip Technology Inc.
circuit
x = Bit is unknown
Mode”). Bits 7 and 6 are
Alert Pol.
R/W-0
R/W-0
Configuration”).
stops
boundary
Mode”).
Register 5-2
Alert Mod.
converting
R/W-0
SHDN
R/W-0
HYST
UPPER
bit 8
bit 0
(see
)”.
,