MAX1617 ON Semiconductor, MAX1617 Datasheet - Page 10

• Manufacturer Part Number: MAX1617
• Description: SMBus Temperature Sensor with Internal and External Diode Input
• Manufacturer: ON Semiconductor

Configuration Register (Config), 8–Bits,
Read/Write
Configuration Register (Config)
A/D Conversion Rate Register (CONV_RATE),
8–Bits, Read/Write
A/D Conversion Rate Register (CONV_RATE)
A/D Conversion Rate Selection
NOTE: Conversion rate denotes actual sampling of both internal
Temperature Registers, 8–Bits, Read–Only
(INT_TEMP, EXT_TEMP)
registers represents temperature of the internal and external
sensors following a conversion cycle. The registers are
automatically updated in an alternating manner.
Internal Temperature Register (INT_TEMP)
External Temperature Register (EXT_TEMP)
registers, each unit value represents one degree (Celsius).
Mask1
D[5]—D[0]
MSB
MSB
D[7]
D[7]
D[7]
D[7:3]
D[2:0]
The binary value (2’s complement format) in these two
In the two temperature data and four threshold setpoint
D[7]
D2
Bit
0
0
0
0
1
1
1
1
D[7]
D[6]
Bit
D[6]
D[6]
D[6]
Chip Stop
x
x
D1
POR State
0
0
1
1
0
0
1
1
and external sensors.
POR State
D[6]
Reserved
010b
0
D[5]
D[5]
D[5]
0
0
0
x
x
D0
0
1
0
1
0
1
0
1
Reserved
D[5]
D[4]
Function
Reserved — Always
returns zero when
read.
Conversion rate bits.
D[4]
D[4]
Function
Interrupt Mask
(see text)
Standby switch
Reserved —
Always returns
zero when read.
x
x
Conversion Rate Samples/sec
0.0625
0.125
0.25
0.5
1.0
2.0
4.0
8.0
D[4]
D[3]
D[3]
D[3]
x
x
D[3]
MSB
D[2]
D[2]
D[2]
x
x
D[2]
Operation
1 = mask ALERT
ALERT
1 = standby,
0 = normal
N/A
0 = don’t mask
D[1]
D[1]
D[1]
Operation
N/A
See below.
X
x
x
D[1]
http://onsemi.com
D[0]
LSB
D[0]
LSB
D[0]
LSB
D[0]
MAX1617
10
The value is in 2’s–complement binary format such that a
reading of 00000000b corresponds to 0 C. Examples of this
temperature–to–binary value relationship are shown in the
following table.
Temperature–to–Digital Value Conversion (INT_TEMP,
EXT_TEMP, INT_HLIM, INT_LLIM,EXT_HLIM,
EXT_LLIM)
Temperature Threshold Setpoint Registers,
8–Bits, Read–Write (INT_HLIM, INT_LLIM,
EXT_HLIM, EXT_LLIM)
temperature setpoints for event detection. The value is in
2’s–complement binary. INT_HLIM and INT_LLIM are
compared with the INT_TEMP value, and EXT_HLIM and
EXT_LLIM are compared with EXT_TEMP. These
registers may be written at any time.
Internal High Limit Setpoint Register (INT_HLIM)
Internal Low Limit Setpoint Register (INT_LLIM)
External High Limit Setpoint Register (EXT_HLIM)
External Low Limit Setpoint Register (EXT_LLIM)
NOTE: POR states:
MSB
MSB
MSB
MSB
D[7]
D[7]
D[7]
D[7]
Temperature
These registers store the values of the upper and lower
+130.00 C
+127.00 C
+126.50 C
—25.00 C
—25.25 C
—54.75 C
—55.00 C
—65.00 C
+25.25 C
—0.25 C
—0.50 C
—0.75 C
—1.00 C
+0.50 C
+0.25 C
Actual
0.00 C
INT_HLIM
INT_LLIM
EXT_HLIM
EXT_LLIM
D[6]
D[6]
D[6]
D[6]
x
x
x
x
D[5]
D[5]
D[5]
D[5]
x
x
x
x
Temperature
Rounded
+127 C
+127 C
+127 C
—25 C
—25 C
—55 C
—55 C
—65 C
+25 C
—1 C
—1 C
+1 C
0 C
0 C
0 C
0 C
D[4]
D[4]
D[4]
D[4]
x
x
x
x
01111111b
11001001b
01111111b
11001001b
D[3]
D[3]
D[3]
D[3]
x
x
x
x
00011001
00000001
00000000
00000000
00000000
00000000
11001001
11001001
11100111
11100110
01111111
01111111
01111111
10111111
11111111
11111111
Binary
Value
D[2]
D[2]
D[2]
D[2]
x
x
x
x
+127 C
—55 C
+127 C
—55 C
D[1]
D[1]
D[1]
D[1]
x
x
x
x
Value
Hex
7F
7F
7F
FF
FF
E7
E7
C9
C9
BF
19
01
00
00
00
00
D[0]
LSB
D[0]
D[0]
LSB
D[0]
LSB
LS