MAX6651EEE+ Maxim Integrated Products, MAX6651EEE+ Datasheet - Page 6

• Manufacturer Part Number: MAX6651EEE+
• Description: IC REG/MONITOR FAN-SPEED 16-QSOP
• Manufacturer: Maxim Integrated Products
• Type: Fan Speed Regulatorr

Specifications of MAX6651EEE+

• Applications: Fan Controller, Brushless (BLDC)
• Number Of Outputs: 1
• Voltage - Load: 0.3 V ~ 5.2 V
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Product: Fan / Motor Controllers / Drivers
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 10 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Fan-Speed Regulators and Monitors
with SMBus/I
The MAX6650/MAX6651 employ three standard SMBus
protocols: write byte, read byte, and receive byte
(Figure 2). The shorter protocol (receive) allows quicker
transfers, provided that the correct data register was
previously selected by a write or read byte instruction.
Use caution with the shorter protocol in multimaster
systems, since a second master could overwrite the
command byte without informing the first master.
The device address can be set to one of four different
values. Accomplish this by pin-strapping ADD so that
more than one MAX6650/MAX6651 can reside on the
same bus without address conflicts (Table 1).
Figure 1. Block Diagram
6
_______________________________________________________________________________________
INTERFACE
SMBus/I
3V TO 5.5V
10kΩ
V
2
CC
C
V
SCL
SDA
ADD
GND
CC
ALARM ENABLE
ALARM STATUS
ADDRESS
DECODE
TACH COUNT
GPIO STATUS
COUNT TIME
CONFIGURE
INTERFACE
FAN SPEED
SMBus/I
GPIO DEF
DAC
2
2
C
C-Compatible Interface
Slave Addresses
MAX6650
MAX6651
TACHOMETER
CONTROL
COUNT
LOGIC
8-BIT
DAC
V
REF
10kΩ
Table 1. Slave Address Decoding (ADD)
V
OFFSET
90kΩ
10kΩ
No connection (high-Z)
10kΩ resistor to GND
90kΩ
ADD
GND
V
CC
(FIGURE 5)
BLOCKS
GPIO
TACH0
GPIO0
GPIO1
OUT
FB
V
FAN
FULL ON
ALERT
= 5V OR 12V
ADDRESS
1001 000
1001 011
0011 011
0011 111
BINARY
FAN