Rainbow Electronics MAX6683 - Manual

General Description
The MAX6683 system supervisor monitors multiple
power-supply voltages, including its own, and also fea-
tures an on-board temperature sensor. The MAX6683
converts voltages to an 8-bit code and temperatures to
an 11-bit (10-bit-plus-sign) code using an analog-to-
digital converter (ADC). A multiplexer automatically
sequences through the voltage and temperature mea-
surements. The digitized signals are then stored in reg-
isters and compared to the over/underthreshold limits
programmed over the SMBus™/I
2 C™-compatible 2-
wire serial interface.
When a temperature measurement exceeds the pro-
grammed threshold, or when an input voltage falls out-
side the programmed voltage limits, the MAX6683
generates a latched interrupt output ALERT. Three
interrupt modes are available for temperature excur-
sions. These are default mode, one-time interrupt
mode, and comparator mode. The ALERT output is
cleared, except for temperature interrupts generated in
comparator mode, by reading the Interrupt Status reg-
ister (Table 5). The ALERT output can also be masked
by writing to the appropriate bits in the Interrupt Mask
register (Table 6) or by setting bit 1 of the Configuration
register (Table 4) to zero. The MAX6683 SMBus/I
2 C-
compatible interface also responds to the SMB alert
response address.
Applications
Workstations
Servers
Networking
Telecommunications
Features
♦ Monitors Local Temperature
♦ Monitors Three External Voltages (1.8V, 2.5V, 5V
Nominal)
♦ Monitors V
CC
(3.3V Nominal)
♦ User-Programmable Voltage and Temperature
Thresholds
♦ Alert Function with Ability to Respond to SMB
Alert Response Address
♦ +2.7V to +5.5V Supply Range
♦ -40°C to +125°C Temperature Range
♦ 60Hz or 50Hz Line-Frequency Rejection
♦ Tiny 10-Pin µMAX Package
♦ MAX6683EVKIT Available
MAX6683
Temperature Sensor and System Monitor
in a 10-Pin µMAX
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
5
10
9
8
7
6
V
CC
SCL
SDA
ADD N.C.
5V IN
2.5V IN
1.8V
IN
MAX6683
TOP VIEW
GND ALERT
Pin Configuration
19-2226; Rev 0; 10/01
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX6683AUB -40°C to +125°C 10 µMAX
SMBus is a trademark of Intel Corp.
I
2 C is a trademark of Philips Corp.
I 2 C/SMBus
CONTROLLER
CPU
V CC
V CC = +3.3V
SCL
SDA
ADD
1.8V IN
2.5V IN
5V IN
N.C.
GND
TO 1.8V
1.8V
TO 2.5V
TO 5V
0.1 µF
10k Ω
ALERT
Typical Application Circuit