MAX6697UP9C+ Maxim Integrated Products, MAX6697UP9C+ Datasheet - Page 8

• Manufacturer Part Number: MAX6697UP9C+
• Description: IC TEMP MON 7CH PREC 20TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6697UP9C+

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Buffer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: I²C™/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: 20-TSSOP
• 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: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

conversion results until they have been read. If the
most significant bits have not been read within an
SMBus timeout period (nominally 37ms), normal updat-
ing continues. Table 1 shows the main temperature
register (high byte) data format, and Table 2 shows the
extended resolution register (low byte) data format.
7-Channel Precision Temperature Monitor
Figure 2. SMBus Protocols
8
Table 1. Main Temperature Register
(High Byte) Data Format
Write Byte Format
Send Byte Format
S = Start condition
P = Stop condition
S
S
_______________________________________________________________________________________
S
Diode fault (open)
Diode fault (short)
ADDRESS
Slave Address: equiva-
lent to chip-select line
ADDRESS
TEMP (°C)
7 bits
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
7 bits
<0.00
>127
0.00
127
126
ADDRESS
25
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
1111 1111 or 1110 1110
COMMAND
DIGITAL OUTPUT
Command Byte: selects
which register you are
reading from
8 bits
COMMAND
0111 1111
0111 1111
0111 1110
0001 1001
0000 0000
0000 0000
1111 1111
ACK
8 bits
ACK
Command Byte: selects which
register you are writing to
ACK
COMMAND
P
8 bits
S
Receive Byte Format
If a channel’s input DXP_ and DXN_ are left open, the
MAX6697 detects a diode fault. An open diode fault
does not cause either ALERT or OVERT to assert. A bit
in the status register for the corresponding channel is
set to 1 and the temperature data for the channel is
stored as all 1s (FFh). It takes approximately 4ms for
the MAX6697 to detect a diode fault. Once a diode fault
is detected, the MAX6697 goes to the next channel in
Table 2. Extended Resolution Temperature
Register (Low Byte) Data Format
S
Slave Address: repeated
due to change in data-
flow direction
ADDRESS
7 bits
ADDRESS
ACK
TEMP (°C)
7 bits
+0.125
+0.250
+0.375
+0.500
+0.625
+0.725
+0.875
0
Data Byte: data goes into the register
set by the command byte (to set
thresholds, configuration masks, and
sampling rate)
RD
DATA
RD
8 bits
ACK
ACK
Diode Fault Detection
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 Byte: reads from
the register set by the
command byte
DATA
8 bits
DATA
8 bits
DIGITAL OUTPUT
ACK
000X XXXX
001X XXXX
010X XXXX
011X XXXX
100X XXXX
101X XXXX
110X XXXX
111X XXXX
///
///
P
1
P
P