MCP4461-502E/ML Microchip Technology, MCP4461-502E/ML Datasheet - Page 41

• Manufacturer Part Number: MCP4461-502E/ML
• Description: IC DGTL POT 257TAPS 5K 20QFN
• Manufacturer: Microchip Technology

Specifications of MCP4461-502E/ML

• Memory Type: Non-Volatile
• Taps: 257
• Resistance (ohms): 5K
• Number Of Circuits: 4
• Temperature Coefficient: 150 ppm/°C Typical
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-VFQFN Exposed Pad
• End To End Resistance: 5kohm
• Track Taper: Linear
• Resistance Tolerance: ± 20%
• No. Of Steps: 257
• Supply Voltage Range: 2.7V To 5.5V
• Control Interface: I2C
• No. Of Pots: Quad
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.0
This Data Sheet covers a family of four nonvolatile Dig-
ital Potentiometer and Rheostat devices that will be
referred to as MCP44XX. The MCP44X1 devices are
the Potentiometer configuration, while the MCP44X2
devices are the Rheostat configuration.
As the
main functional blocks. These are:
•
•
•
•
The POR/BOR operation and the Memory Map are
discussed in this section and the Resistor Network and
I
Device Commands
Section 7.0.
4.1
The Power-on Reset is the case where the device is
having power applied to it from V
Reset occurs when a device had power applied to it,
and that power (voltage) drops below the specified
range.
The devices RAM retention voltage (V
than the POR/BOR voltage trip point (V
maximum V
When V
performance
specifications. In this region, the device is capable of
reading and writing to its EEPROM and incrementing,
decrementing, reading and writing to its volatile
memory if the proper serial command is executed.
When V
pin weak pull-ups are enabled.
4.1.1
When the device powers up, the device V
the V
the V
• The volatile wiper register is loaded with value in
• The TCON registers are loaded with their default
• The device is capable of digital operation
© 2010 Microchip Technology Inc.
2
C operation are described in their own sections. The
POR/BOR and RESET Operation
Memory Map
Resistor Network
Serial Interface (I
the corresponding nonvolatile wiper register
value
POR
POR
Device Block Diagram
DD
FUNCTIONAL OVERVIEW
POR/BOR and RESET Operation
/V
POR
/V
< V
BOR
BOR
POWER-ON RESET
POR
/V
POR
BOR
may
/V
voltage. Once the V
voltage, the following happens:
BOR
/V
2
BOR
< V
C)
not
voltage is less then 1.8V.
commands are discussed in
or the RESET pin is Low, the
DD
meet
< 2.7V, the electrical
shows, there are four
SS
DD
the
. The Brown-out
POR
voltage crosses
RAM
data
DD
/V
) is lower
BOR
will cross
). The
sheet
4.1.2
When the device powers down, the device V
cross the V
Once the V
voltage, the following happens:
• Serial Interface is disabled
• EEPROM Writes are disabled
If the V
the following happens:
• Volatile wiper registers may become corrupted
• TCON registers may become corrupted
As the voltage recovers above the V
see
Serial commands not completed due to a brown-out
condition may cause the memory location (volatile and
nonvolatile) to become corrupted.
4.1.3
The RESET pin can be used to force the device into
the POR/BOR state of the device. When the RESET
pin is forced Low, the device is forced into the reset
state. This means that the TCON and STATUS
registers are forced to their default values and the
volatile wiper registers are loaded with the value in the
corresponding Nonvolatile wiper register. Also the I
interface is disabled. Any nonvolatile write cycle is not
interrupted, and allowed to complete.
This feature allows a hardware method for all registers
to be updated at the same time.
4.1.4
Figure 4-1
POR/BOR signal interact to control the hardware reset
state of the device.
FIGURE 4-1:
RESET Pin Interaction.
RESET (from pin)
Section 4.1.1 “Power-on
POR/BOR signal
DD
voltage decreases below the V
DD
shows how the RESET pin signal and the
POR
BROWN-OUT RESET
RESET PIN
INTERACTION OF RESET PIN AND
BOR/POR CIRCUITRY
voltage decreases below the V
MCP444X/446X
/V
BOR
voltage.
POR/BOR Signal and
Reset”.
POR
DS22265A-page 41
Device reset
/V
RAM
BOR
POR
voltage,
voltage,
DD
/V
BOR
will
2
C