MAX6615AEE+ Maxim Integrated Products, MAX6615AEE+ Datasheet - Page 6

• Manufacturer Part Number: MAX6615AEE+
• Description: IC TEMP MONITOR DL-CH 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6615AEE+

• Function: Fan Control, Temp Monitor
• Topology: ADC, PWM Generator, Tach Counter
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX6615/MAX6616 accurately monitor two tem-
perature channels, either the internal die temperature
and the temperature of an external thermistor, or the
temperatures of two external thermistors. They report
temperature values in digital form using a 2-wire
SMBus/I
MAX6616 operate from a supply voltage range of 3.0V
to 5.5V and consume 500µA (typ) of supply current.
The temperature data controls the duty cycles of two
PWM output signals that are used to adjust the speed
of a cooling fan. They also feature an overtemperature
alarm output to generate interrupts, throttle signals, or
shutdown signals.
The MAX6616 also includes six GPIO input/outputs to
provide additional flexibility. The GPIO0 power-up state
is set by connecting the GPIO PRESET input to ground
or V
From a software perspective, the MAX6615/MAX6616
appear as a set of byte-wide registers. Their devices use
a standard SMBus 2-wire/I
to access the internal registers. The MAX6615/MAX6616
Dual-Channel Temperature Monitors and
Fan-Speed Controllers with Thermistor Inputs
Figure 1. SMBus Protocols
6
WRITE BYTE FORMAT
READ BYTE FORMAT
SEND BYTE FORMAT
S = START CONDITION
P = STOP CONDITION
—
—
S
S
_______________________________________________________________________________________
CC
—
S
.
ADDRESS
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE
2
ADDRESS
C-compatible serial interface. The MAX6615/
7 BITS
7 BITS
SLAVE ADDRESS: EQUIVA-
LENT TO CHIP-SELECT LINE
OF A 3-WIRE INTERFACE
ADDRESS
7 BITS
WR
—
WR
—
Detailed Description
SMBus Digital Interface
ACK
2
—
C-compatible serial interface
ACK
WR
—
—
COMMAND BYTE: SENDS COM-
MAND WITH NO DATA, USUALLY
USED FOR ONE-SHOT COMMAND
SHADED = SLAVE TRANSMISSION
/// = NOT ACKNOWLEDGED
COMMAND
8 BITS
COMMAND BYTE:
SELECTS WHICH
REGISTER YOU ARE
READING FROM
COMMAND
8 BITS
ACK
—
ACK
—
COMMAND BYTE: SELECTS
WHICH REGISTER YOU ARE
WRITING TO
ACK
—
COMMAND
—
8 BITS
P
—
S
RECEIVE BYTE FORMAT
have nine different slave addresses available; therefore, a
maximum of nine MAX6615/MAX6616 devices can share
the same bus.
The MAX6615/MAX6616 employ four standard SMBus
protocols: write byte, read byte, send byte, and receive
byte (Figures 1, 2, and 3). The shorter receive byte proto-
col allows quicker transfers, provided that the correct
data register was previously selected by a read byte
instruction. Use caution with the shorter protocols in mul-
timaster systems, since a second master could overwrite
the command byte without informing the first master.
Temperature data can be read from registers 00h and
01h. The temperature data format for these registers is
8 bits, with the LSB representing 1°C (Table 1) and the
MSB representing 128°C. The MSB is transmitted first.
All values below 0°C clip to 00h.
Table 3 details the register address and function, whether
they can be read or written to, and the power-on reset
—
S
SLAVE ADDRESS: REPEAT-
ED DUE TO CHANGE IN
DATA- FLOW DIRECTION
ADDRESS
7 BITS
ADDRESS
ACK
7 BITS
—
DATA BYTE: DATA GOES INTO THE REG-
ISTER SET BY THE COMMAND BYTE (TO
SET THRESHOLDS, CONFIGURATION
MASKS, AND SAMPLING RATE)
RD
—
8 BITS
DATA
RD
—
ACK
—
DATA BYTE: READS DATA FROM
THE REGISTER COMMANDED BY
THE LAST READ BYTE OR WRITE
BYTE TRANSMISSION; ALSO
USED FOR SMBUS ALERT
RESPONSE RETURN ADDRESS
ACK
—
DATA BYTE: READS
FROM THE REGISTER
SET BY THE COMMAND
BYTE
8 BITS
DATA
DATA
8 BITS
ACK
—
—
///
—
///
P
1
—
—
P
P