MIC284_05 Datasheet, PDF (14/20 Pages) Micrel Semiconductor – Two-Zone Thermal Supervisor

MIC284
Register Set and Programmer’s Model
Internal Register Set
Name
Description
TEMP0
local temperatur e
CONFIG configuration registe r
T_HYST0
local hysteresi s
T_SET0 local temperature setpoin t
TEMP1
remote temperatur e
T_HYST1
remote hysteresi s
T_SET1
remote temperature
setpoint
nCRIT1
over-temperature
hysteresis
CRIT1
over-temperature
temperature setpoint
Command Byte
00_h
01_h
02_h
03_h
10_h
12_h
13_h
22_h
23_h
Operatio n
8-bit read only
8-bit read/write
8-bit read/write
8-bit read/write
8-bit read only
8-bit read/write
8-bit read/write
8-bit read/write
8-bit read/write
Power-Up Default
00_h (0° C)⁽¹⁾
00_h ⁽²⁾
4C_h(+76° C)
51_h(+81° C)
00_h (0° C)⁽¹⁾
5C_h(+92° C)
61_h(+97° C)
5C_h(+92° C)
61_h(+97° C)
(1) TEMP0 and TEMP1 will contain measured temperature data after the completion of one conversion cycle.
(2) After the first Fault_Queue conversions are complete, status bits will be set if TEMPx > T_SETx or TEMP1 > CRIT1.
Detailed Register Descriptions
Configuration Register
D[7]
read only
local
status
(S0)
D[6]
read only
remote
status
(S1)
CONFIGURATION REGISTER (CONFIG)
8-Bit Read/Write
D[5]
D[4]
D[3]
D[2]
read only
read/write
read/write
/CRIT
status
(CRIT1)
fault queue
depth
(FQ[1:0])
interrupt
mask
(IM)
D[1]
read/write
CMP/INT
mode
(MODE)
D[0]
read/write
Shutdown
(SHDN)
Bits
Functio n
S0 local interrupt status (read only )
S1 remote interrupt status (read only )
CRIT1 remote over-temperature status (read only )
FQ[1:0] Fault_Queue dept h
IM interrupt mask
MODE
comparator/interrupt
mode selection for /INT pin
SHDN
normal/shutdown
operating mode selection
Operatio n
1 = event occured, 0 = no event
1 = event occured, 0 = no event
1 = over-temperature, 0 = no event
00 = 1 conversion, 01 = 2 conversions,
10 = 4 conversions, 11 = 6 conversions
1 = disabled, 0 = interrupts enabled
1 = interrupt mode,
0 = comparator mode
1 = shutdown,
0 = normal
CONFIG Power-Up Value: 0000 0000_b = 00_h(*)
• not in shutdown mode
• comparator mode
• /INT = active low
• Fault_Queue depth = 1
• interrupts enabled.
• no temperature events pending
CONFIG Command Byte Value: 0000 0001_b = 01_h
* Following the first Fault_Queue conversions, one or more of the status bits may be set.
Micrel, Inc
MIC284
14
September 2005