MAX1617 ON Semiconductor, MAX1617 Datasheet - Page 3

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

SCL
MAX1617.
SDA
both directions using this pin.
ADD1, ADD0
“tri–state,” and the SMBus addresses are specified in the
Address Decode Table below.
MAX1617s on a single bus. A match between the
MAX1617’s address and the address specified in the serial
bit stream must be made to initiate communication. Many
SMBus–compatible devices with other addresses may share
the same 2–wire bus. These pins are only active at power–on
reset, and will latch into the appropriate states.
ALERT
corresponds to the general SMBALERT signal and indicates
an interrupt event. The MAX1617 will respond to the
standard SMBus Alert Response Address when ALERT is
asserted. Normally, the ALERT output will be asserted when
any of the following occurs:
MASK1 bit in the CONFIG register. If the MASK1 bit is set
to “1,” no interrupts will be generated on ALERT. The
ALERT output is cleared and re–armed by the Alert
Response Address
WIRE–ORed with similar outputs from other SMBus
devices. If the alarm condition persists after the ARA, the
ALERT output will be immediately re–asserted.
PIN DESCRIPTION
1, 5, 9, 13, 16
Input. SMBus serial clock. Clocks data into and out of the
Bi–directional. Serial data is transferred on the SMBus in
Inputs. Sets the 7–bit SMBus address. These pins are
(NOTE: The tri–state scheme allows up to nine
Output, Open Collector, Active Low. The ALERT output
INT_TEMP equal to or exceeds INT_HLIM
INT_TEMP falls below INT_LLIM
EXT_TEMP equal to or exceeds EXT_HLIM
EXT_TEMP falls below EXT_LLIM
External Diode “Open”
The operation of the ALERT output is controlled by the
Pin No.
6, 10
7, 8
11
12
14
15
2
3
4
ADD[1:0]
Symbol
ALERT
STBY
GND
V DD
SDA
SCL
NC
D +
D –
(ARA).
Bi–Directional
Bi–Directional
Bi–Directional
Output
Power
Power
Type
Input
Input
Input
This
—
output
Power Supply Input
Current Source and A/D Positive Input
Current Sink and A/D Negative Input
Address Select Pins (See Address Decode Table)
System Ground
SMBus Interrupt (SMBALERT) or Comparator Output
SMBus Serial Data
SMBus Serial Clock
Standby Enable
Not Connected
may
PIN DESCRIPTION
http://onsemi.com
MAX1617
be
3
it is an open–drain output. Current sourced from the pull–up
resistor causes power dissipation and may cause internal
heating of the MAX1617. To avoid affecting the accuracy of
internal temperature readings, the pull–up resistors should
be made as large as possible.)
STBY
using either the STBY pin or the CHIP STOP bit (CONFIG
register). If STBY is pulled low, the MAX1617
unconditionally enters its low–power Standby mode. The
temperature–to–digital conversion process is halted, but
ALERT remains functional. The MAX1617’s bus interface
remains active, and all registers may be read from and
written to normally. The INT_TEMP and EXT_TEMP
registers will contain whatever data was valid at the time of
Standby. (Transitions on SDA or SCL due to external bus
activity may increase the Standby power consumption.)
D +
external diode and is the positive A/D input. Current is
injected into the external diode from the MAX1617, and the
temperature proportional V
digital temperature data.
D —
external diode. Current is sunk from the external diode into
the MAX1617 through this pin. It also is the negative input
terminal to the MAX1617’s A/D converter. This node is kept
at approximately 0.7V above GROUND.
V DD
GND
(NOTE: A pull–up resistor is necessary on ALERT since
Input. The activation of Standby mode may be achieved
Bi–directional. this pin connects to the anode of the
Bi–directional. This pin connects to the cathode of the
Input. Power supply input. See electrical specifications.
Input. Ground return for all MAX1617 functions.
Description
BE
is measured and converted to