MAX6693UP9A+ Maxim Integrated Products, MAX6693UP9A+ Datasheet - Page 9

• Manufacturer Part Number: MAX6693UP9A+
• Description: IC TEMP MONITOR 7CH 20-TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6693UP9A+

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Buffer, Multiplexer, Register Bank
• 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 ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX6693 employs four standard SMBus protocols:
write byte, read byte, send byte, and receive byte
(Figure 2). The shorter receive byte protocol allows
quicker transfers, provided that the correct data regis-
ter was previously selected by a read byte instruction.
Use caution with the shorter protocols in multimaster
systems, since a second master could overwrite the
command byte without informing the first master. Figure
3 is the SMBus write-timing diagram and Figure 4 is the
SMBus read-timing diagram.
The remote diode 1 measurement channel provides 11
bits of data (1 LSB = 0.125°C). All other temperature-
measurement channels provide 8 bits of temperature
Figure 2. SMBus Protocols
Table 1. Main Temperature Register
(High-Byte) Data Format
Diode fault (open or short)
WRITE BYTE FORMAT
READ BYTE FORMAT
SEND BYTE FORMAT
S
S
S = START CONDITION.
P = STOP CONDITION.
S
SLAVE ADDRESS: EQUIVA-
LENT TO CHIP SELECT LINE
TEMP (°C)
ADDRESS
ADDRESS
> +127
7 BITS
7 BITS
SLAVE ADDRESS: EQUIVA-
LENT TO CHIP-SELECT LINE OF
A 3-WIRE INTERFACE
+127
+126
+25
< 0
0
ADDRESS
7-Channel Precision Temperature Monitor
7 BITS
_______________________________________________________________________________________
WR
WR
SHADED = SLAVE TRANSMISSION.
/// = NOT ACKNOWLEDGED.
ACK
ACK
WR
COMMAND BYTE: SENDS COM-
MAND WITH NO DATA, USUALLY
USED FOR ONE-SHOT COMMAND
COMMAND BYTE: SELECTS
WHICH REGISTER YOU ARE
REDING FROM
COMMAND
DIGITAL OUTPUT
COMMAND
8 BITS
8 BITS
0111 1111
0111 1111
0111 1110
0001 1001
0000 0000
0000 0000
1111 1111
ACK
ACK
ACK
P
COMMAND
8 BITS
with Beta Compensation
S
data (1 LSB = 1°C). The 8 most significant bits (MSBs)
can be read from the local temperature and remote
temperature registers. The remaining 3 bits for remote
diode 1 can be read from the extended temperature
register. If extended resolution is desired, the extended
resolution register should be read first. This prevents
the most significant bits from being overwritten by new
conversion results until they have been read. If the most
significant bits have not been read within an SMBus
timeout period (nominally 37ms), normal updating con-
tinues. Table 1 shows the main temperature register
(high-byte) data format, and Table 2 shows the extend-
ed resolution register (low-byte) data format.
RECEIVE BYTE FORMAT
Table 2. Extended Resolution Temperature
Register (Low-Byte) Data Format
SLAVE ADDRESS: REPEATED
DUE TO CHANGE IN DATA-
FLOW DIRECTION
S
ADDRESS
7 BITS
ADDRESS
7 BITS
ACK
TEMP (°C)
+0.125
+0.250
+0.375
+0.500
+0.625
+0.750
+0.875
0
RD
DATA BYTE: DATA GOES INTO THE REGISTER
SET BY THE COMMAND BYTE (TO SET
THRESHOLDS, CONFIGURATION MASKS, AND
SAMPLING RATE)
RD
DATA
8 BITS
ACK
ACK
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
DIGITAL OUTPUT
000X XXXX
001X XXXX
010X XXXX
011X XXXX
100X XXXX
101X XXXX
110X XXXX
111X XXXX
///
///
P
1
P
P
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