Datasheet

 2015-2017 Microchip Technology Inc. DS20005426C-page 33
MCP9600
5.3.2 ALERT HYSTERESIS REGISTER
This device integrates four individually controlled
temperature Alert Hysteresis registers for each alert
output, with a range of 0°C to +255°C.
The alert hysteresis directions are set using bit 3 of
the corresponding Alert Configuration registers
(Register 5-10) to detect rising or falling temperatures.
For rising temperatures, the hysteresis range is below
the alert limit where, as for falling temperatures, the
hysteresis range is above the alert limit, as shown in
Figure 5-10.
FIGURE 5-10: Graphical Description of Alert Output Hysteresis Direction.
TABLE 5-5: ALERT HYSTERESIS
REGISTERS
Register Register Pointer
Alert 1 Hysteresis – T
HYST1
0000 1100
Alert 2 Hysteresis – T
HYST2
0000 1101
Alert 3 Hysteresis – T
HYST3
0000 1110
Alert 4 Hysteresis –
THYST4
0000 1111
REGISTER 5-10: T
HYSTx
: ALERT 1, 2, 3 AND 4 HYSTERESIS REGISTERS
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R-0 R-0 R-0
128°C 64°C 32°C 16°C 8°C 4°C 2°C 1°C
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 7-0 Alert Hysteresis: Alert Hysteresis Range 0x00 to 0xFF bits (which represents +1°C to +255°C)
Cold Hot
H
y
s
t
e
r
e
s
i
s
Cold Hot
H
y
s
t
e
r
e
s
i
s
T
ALERT
T
HYST
T
ALERT
T
HYST
Rising Temperature Falling Temperature
Alert Output
Cold Hot
H
y
s
t
e
r
e
s
i
s
T
ALERT
T
HYST
Rising Temperature
Cold Hot
H
y
s
t
e
r
e
s
i
s
T
ALERT
T
HYST
Falling Temperature
Alert Output
Alert Output
Alert Output
Active-Low
Active-Low
Active-High
Active-High