MAX6687AU40L+ Maxim Integrated Products, MAX6687AU40L+ Datasheet - Page 4

• Manufacturer Part Number: MAX6687AU40L+
• Description: Board Mount Temperature Sensors Local/Remote Temperature Switch
• Manufacturer: Maxim Integrated Products

Specifications of MAX6687AU40L+

• Temperature Threshold: + 120 C
• Full Temp Accuracy: +/- 3.5 C, +/- 1.5 C
• Package / Case: uSOP
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Output Type: Digital
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX6687/MAX6688 sense the temperatures of
both a remote P-N junction and their own die. The
external P-N junction is typically a base-emitter junction
of a substrate PNP on a microprocessor, FPGA, or
ASIC die (see the Typical Operating Circuit).
The remote temperature switch has a factory-pro-
grammed trip temperature of either +120°C or +125°C
and is intended to be used for system shutdown when
the die temperature of a remote IC, such as a micro-
processor, FPGA, or ASIC exceeds the factory-pro-
grammed thresholds.
The local temperature switch has a pin-programmable
threshold temperature (Table 1). This temperature
switch may be used for such functions as system shut-
down or for turning on a cooling fan when board tem-
perature exceeds the temperature limit. Two
temperature ranges are available for the local trip
Local/Remote Temperature Switches in a
µMAX Package
4
MAX6687
_______________________________________________________________________________________
—
—
1
2
3
4
5
6
7
8
PIN
MAX6688
—
—
1
2
3
4
5
6
7
8
Detailed Description
T
T
T
T
NAME
REMOTE
REMOTE
GND
LOCAL
LOCAL
DXN
DXP
V
S1
S2
DD
Power-Supply Input. Bypass to GND with a 0.1µF capacitor.
Ground
This pin connects to the positive (anode) terminal of the external P-N sense junction. It sources
current into the external junction. A 2200pF capacitor should be connected across DXP and
DXN.
This pin connects to the negative (cathode) terminal of the external P-N sense junction. It sinks
current from the external junction. A 2200pF capacitor should be connected across DXP and
DXN. DXN must be connected to the GND pin at the pin.
Open-Drain Active-Low Output. T
programmed temperature threshold, either +120 C or +125 C. Connect a pullup resistor
(typically 10k ) between T
CMOS Push-Pull, Active-High Output. T
factory-programmed temperature threshold, either +120 C or +125 C.
Open-Drain Active-Low Output. T
programmable temperature threshold set by S1 and S2. Connect a pullup resistor (typically
10k ) between T
CMOS Push-Pull, Active-High Output. T
pin-programmable temperature threshold set by S1 and S2.
Threshold Select Input. Used in conjunction with S2 to set the local threshold temperature
(Table 1). It can be connected to V
Threshold Select Input. Used in conjunction with S1 to set the local threshold temperature
(Table 1). It can be connected to V
LOCAL
and a positive power supply up to 5.5V.
REMOTE
threshold: +40°C to +80°C and +75°C to +115°C. S1
and S2 pins must be set to the desired trip temperature
before power is applied to the V
settings are changed after the power is turned on, the
local trip threshold remains set to the point where S1
and S2 were when power was applied.
Since the MAX6687/MAX6688 are often used for sys-
tem shutdown, they are designed so that the outputs
do not change on transient faults or when power is first
applied. This eliminates the possibility that the IC could
erroneously shut a system down.
The MAX6687/MAX6688 provide noise immunity by
integration and oversampling of the diode voltage, but
good design practice includes routing the DXP and
DXN lines away from noise sources, such as high-
speed digital lines, switching regulators, inductors, and
transformers. The DXP and DXN traces should be
paired together and surrounded by a ground plane
whenever possible.
REMOTE
LOCAL
DD
DD
and a positive power supply up to 5.5V.
, GND, or left floating.
, GND, or left floating.
REMOTE
LOCAL
goes low when the temperature exceeds the pin-
FUNCTION
goes low when the temperature exceeds the factory-
goes high when the temperature exceeds the
goes high when the temperature exceeds the
Pin Description
DD
pin. If S1 and S2