MAX6656MEE+ Maxim Integrated Products, MAX6656MEE+ Datasheet - Page 7

• Manufacturer Part Number: MAX6656MEE+
• Description: IC TEMP SENSOR 4CH 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6656MEE+

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -55°C ~ 125°C, External Sensor
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 11 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 2. SMBus/I
Figure 3. SMBus/I
From a software perspective, the MAX6655/MAX6656
appear as a set of byte-wide registers that contain tem-
perature data, voltage data, alarm threshold values,
and control bits. Use a standard SMBus 2-wire serial
interface to read temperature data and write control
bits and alarm threshold data.
SMBCLK
SMBDATA
SMBCLK
SMBDATA
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
Dual Remote/Local Temperature Sensors and
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
t
t
SU:STA
SU:STA
2
2
C Write Timing Diagram
C Read Timing Diagram
A
A
t
t
HD:STA
_______________________________________________________________________________________
HD:STA
t
t
LOW
LOW
SMBus Digital Interface
B
B
t
t
HIGH
HIGH
t
t
SU:DAT
SU:DAT
C
C
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS DATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = MASTER PULLS DATA LINE LOW
Four-Channel Voltage Monitors
D
D
E
E
F
F
The MAX6655/MAX6656 employ four standard SMBus
protocols: Write Byte, Read Byte, Send Byte, and
Receive Byte (Figures 1, 2, and 3). The two shorter pro-
tocols (Receive and Send) allow quicker transfers, pro-
vided that the correct data register was previously
selected by a Write or Read Byte instruction. Use cau-
tion with the shorter protocols in multimaster systems,
since a second master could overwrite the Command
Byte without informing the first master.
t
t
HD:DAT
HD:DAT
G
G
H
H
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
I
I
J
J
K
K
t
t
SU:STO
SU:STO
L
L
t
t
BUF
BUF
M
M
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