MAX6654MEE-T Maxim Integrated Products, MAX6654MEE-T Datasheet - Page 10

• Manufacturer Part Number: MAX6654MEE-T
• Description: Board Mount Temperature Sensors
• Manufacturer: Maxim Integrated Products

Specifications of MAX6654MEE-T

• Full Temp Accuracy: +/- 5 C
• Package / Case: QSOP-16
• Digital Output - Bus Interface: Serial (2-Wire, I2C)
• Digital Output - Number Of Bits: 10 bit + Sign
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Output Type: Digital
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 3. SMBus Protocols
Figure 5. SMBus Read Timing Diagram
Figure 4. SMBus Write Timing Diagram
1°C Accurate Remote/Local Temperature
Sensor with SMBus Serial Interface
Write Byte Format
Read Byte Format
Send Byte Format
S = Start condition
P = Stop condition
10
SMBCLK
SMBDATA
S
S
S
______________________________________________________________________________________
ADDRESS
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
Slave Address: equiva-
lent to chip-select line
ADDRESS
7 bits
t
SU:STA
SMBCLK
SMBDATA
7 bits
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
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
A
ADDRESS
t
HD:STA
7 bits
t
SU:STA
WR
t
LOW
Shaded = Slave transmission
/// = Not acknowledged
A
WR
t
HD:STA
B
t
HIGH
ACK
t
LOW
ACK
WR
B
Command Byte: sends com-
mand with no data, usually
used for one-shot command
t
t
COMMAND
HIGH
SU:DAT
C
8 bits
Command Byte: selects
which register you are
reading from
COMMAND
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
t
8 bits
SU:DAT
ACK
C
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = SLAVE PULLS SMBDATA LINE LOW
D
ACK
Command Byte: selects which
register you are writing to
D
ACK
E
COMMAND
P
F
8 bits
E
F
S
Receive Byte Format
G
t
HD:DAT
S
Slave Address: repeated
due to change in data-
flow direction
ADDRESS
7 bits
G
ADDRESS
ACK
7 bits
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLEAR PULSE
H
Data Byte: data goes into the register
set by the command byte (to set
thresholds, configuration masks, and
sampling rate)
H
RD
J = ACKNOWLEDGE CLOCKED INTO MASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION, DATA EXECUTED BY SLAVE
M = NEW START CONDITION
DATA
8 bits
RD
I
I
ACK
J
J K
ACK
K
Data Byte: reads from
the register set by the
command byte
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
DATA
8 bits
DATA
8 bits
ACK
t
SU:STO
J = STOP CONDITION, DATA
K = NEW START CONDITION
EXECUTED BY SLAVE
L
t
BUF
t
SU:STO
///
///
M
L
t
BUF
P
1
P
M
P