MIC280 Datasheet, PDF (14/23 Pages) Micrel Semiconductor – Precision IttyBitty Thermal Supervisor

MIC280
D[7]
read-only
S7
D[6]
read-only
S6
D[5]
read-only
S5
Status Register (STATUS)
8-bits, read-only
Status Register
D[4]
read-only
D[3]
read-only
S4
S3
D[2]
read-only
S2
D[1]
read-only
S1
Micrel
D[0]
read-only
S0
Bit(s)
S7
S6
S5
S4
S3
S2
S1
S0
Function
Data ready
Local high temperature event
Local low temperature event
Remote high temperature event
Remote low temperature event
Diode fault
Remote over-temperature event
Local over-temperature event
Operation*
1 = data available
0 = ADC busy
1 = event occurred, 0 = none
1 = event occurred, 0 = none
1 = event occurred, 0 = none
1 = event occurred, 0 = none
1 = fault, 0 = none
1 = event occurred, 0 = none
1 = event occurred, 0 = none
* All status bits are cleared after any read operation is performed on STATUS.
Power-up default value:
0000 0000_b = 00_h (no events pending)
Read command byte:
0000 0010_b = 02_h
The power-up default value is 00h. Following the first conversion, however, any of the status bits may be set depending on
the measured temperature results or the existence of a diode fault.
D[7]
read/write
Interrupt
Enable
(IE)
D[6]
read/write
Shut-down
(SHDN)
Configuration Register (CONFIG)
8-bits, read/write
Configuration Register
D[5]
reserved
D[4]
reserved
D[3]
reserved
D[2]
reserved
Fault Queue
Resolution
(FQ[1:0])
(RES[1:0])
D[1]
reserved
Reserved
D[0]
reserved
Reset
(RST)
Bits(s) Function
Operation*
IE
Interrupt enable
1 = interrupts enabled,
0 = disabled
SHDN
Selects operating mode: normal/shutdown
1 = shutdown, 0 = normal
FQ[1:0] Depth of fault queue*
[00]=1, [01]=2, [10]=4, [11]=6
RES[1:0] A/D converter resolution for external zone - affects conversion rate
[00]=9-bits, [01]=10-bits,
[10]=11-bits, [11]=12-bits
D[1]
Reserved
always write as zero!
RST
Resets all MIC280 functions and restores the power-up default state
write only; 1 = reset, 0 =
normal
operation; disabled by
setting L4
Power-up default value:
1000 0000_b = 80_h (Not in shutdown mode; Interrupts enabled;
Fault queue depth=1; Resolution = 9 bits)
Read/Write command byte: 0000 0011_b = 03_h
* Any write to CONFIG will result in the fault queues being purged and reset and any A/D conversion in progress being aborted and the result
discarded. The A/D will begin a new conversion sequence once the write operation is complete.
MIC280
14
November 2004