MCP98242-BESLASHST datasheet(15/46 Pages) MICROCHIP

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DS21996A-page 15

MCP98242

5.1.2

SENSOR CONFIGURATION

The MCP98242 has a 16-bit Configuration register

(CONFIG) that allows the user to set various functions

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,

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

prevent output chatter when the ambient

temperature

gradually

changes

beyond

the

user-specified

temperature

boundary

(see

Section 5.2.2 “Temperature Hysteresis (THYST)”.

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 “Shutdown

Mode”). 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

(see

Section 5.2.3 “Event Output Configuration”).

CONFIGURATION REGISTER (CONFIG)

→ ADDRESS ‘0000 0001’b

U-0

R/W-0

——

—

THYST

SHDN

bit 15

bit 8

R/W-0

Crit. Lock

Win. Lock

Int. Clear

Event Stat.

Event Cnt.

Event Sel.

Event Pol.

Event Mod.

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-11

Unimplements: Read as ‘0’

bit 10-9

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 “Event Output Configuration”)

bit 8

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.

This bit cannot be set ‘1’ when either of the lock bits is set (bit 6 and bit 7). However, it can be cleared

‘0’ for Continuous Conversion while locked. (Refer to Section 5.2.1 “Shutdown Mode”)

bit 7

TCRIT Lock Bit (Crit. Lock):

0 =

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

1 =

Locked. TCRIT register can not be written

When enabled, this bit remains set ‘1’ or locked until cleared by internal reset (Section 5.4 “Summary

of Temperature Sensor Power-on Default”). This bit does not require a double-write.

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