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MCP98244 Datasheet, PDF (16/52 Pages) Microchip Technology – DDR4 DIMM Temperature Sensor with EEPROM for SPD | |||
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MCP98244
5.1.2
SENSOR CONFIGURATION
REGISTER (CONFIG)
The MCP98244 device has a 16-bit Configuration reg-
ister (CONFIG) that allows the user to set various func-
tions for a robust temperature monitoring system. Bits
10 thru 0 are used to select Event output boundary
hysteresis, device Shutdown or Low-Power mode,
temperature boundary and critical temperature lock, or
temperature Event output enable/disable. In addition,
the user can select the Event output condition (output
set for TUPPER and TLOWER temperature boundary or
TCRIT only), read Event output status and set Event
output polarity and mode (Comparator Output or
Interrupt Output mode).
The temperature hysteresis bits 10 and 9 can be used
to prevent output chatter when the ambient
temperature gradually changes beyond the user-
specified temperature boundary (see Section 5.2.2
âTemperature Hysteresis (THYST)â. The Continuous
Conversion or Shutdown mode is selected using bit 8.
In Shutdown mode, the band gap temperature sensor
circuit stops converting temperature and the Ambient
Temperature register (TA) holds the previous
successfully converted temperature data (see
Section 5.2.1 âShutdown Modeâ). Bits 7 and 6 are
used to lock the user-specified boundaries TUPPER,
TLOWER and TCRIT to prevent an accidental rewrite.
Bits 5 thru 0 are used to configure the temperature
Event output pin. All functions are described in
Register 5-3 (see Section 5.2.3 âEvent Output
Configurationâ).
REGISTER 5-3: CONFIGURATION REGISTER (CONFIG) ï® ADDRESS â0000 0001âb
U-0
â
bit 15
U-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
â
â
â
â
THYST
SHDN
bit 8
R/W-0
Crit. Lock
bit 7
R/W-0
Win. Lock
R/W-0
Int. Clear
R-0
R/W-0
Event Stat. Event Cnt.
R/W-0
Event Sel.
R/W-0
Event Pol.
R/W-0
Event Mod.
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
â1â = Bit is set
U = Unimplemented bit, read as â0â
â0â = Bit is cleared
x = Bit is unknown
bit 15-11
bit 10-9
bit 8
Unimplemented: Read as â0â
TUPPER and TLOWER Limit Hysteresis (THYST):
00 = 0°C (power-up default)
01 = 1.5°C
10 = 3.0°C
11 = 6.0°C
(Refer to Section 5.2.3 âEvent Output Configurationâ)
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.
Shutdown Mode (SHDN):
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.
Event output will deassert.
This bit cannot be set â1â when either of the lock bits is set (bit 6 and bit 7). However, it can be cleared
â0â for Continuous Conversion while locked (Refer to Section 5.2.1 âShutdown Modeâ).
DS22327C-page 16
ï£ 2012-2013 Microchip Technology Inc.
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