MCP4651-503E/ST Microchip Technology, MCP4651-503E/ST Datasheet - Page 37

• Manufacturer Part Number: MCP4651-503E/ST
• Description: IC DGTL POT 50K 256TAPS 14-TSSOP
• Manufacturer: Microchip Technology

Specifications of MCP4651-503E/ST

• Package / Case: 14-TSSOP
• Taps: 257
• Resistance (ohms): 50K
• Number Of Circuits: 2
• Temperature Coefficient: 150 ppm/°C Typical
• Memory Type: Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Resistance In Ohms: 50K
• Number Of Pots: Dual
• Taps Per Pot: 256
• Resistance: 50 KOhms
• Wiper Memory: Volatile
• Digital Interface: Serial (2-Wire, I2C)
• Operating Supply Voltage: 2.5 V or 3.3 V or 5 V
• Supply Current: 0.0025 mA (Typ)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

4.0
This Data Sheet covers a family of thirty-two Digital
Potentiometer and Rheostat devices that will be
referred to as MCP4XXX. The MCP4XX1 devices are
the Potentiometer configuration, while the MCP4XX2
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 “Device Commands”.
4.1
The Power-on Reset is the case where the device is
having power applied to it starting from the V
The Brown-out 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
incrementing, decrementing, reading and writing to its
volatile memory if the proper serial command is exe-
cuted.
4.1.1
When the device powers up, the device V
the V
the V
• Volatile wiper register is loaded with value in the
• The TCON register is loaded it’s default value
• The device is capable of digital operation
© 2008 Microchip Technology Inc.
2
C operation are described in their own sections. The
POR/BOR Operation
Memory Map
Resistor Network
Serial Interface (I
corresponding non-volatile wiper register
POR
POR
Device Block Diagram
FUNCTIONAL OVERVIEW
POR/BOR Operation
/V
POR
/V
BOR
BOR
POWER-ON RESET
POR
/V
BOR
may
/V
voltage. Once the V
voltage the following happens:
BOR
2
< V
C)
not
voltage is less than 1.8V.
commands are discussed in
DD
meet
< 2.7V, the electrical
shows, there are four
DD
the
POR
voltage crosses
RAM
data
DD
/V
) is lower
BOR
will cross
SS
). The
sheet
level.
MCP453X/455X/463X/465X
4.1.2
When the device powers down, the device V
cross the V
Once the V
voltage the Serial Interface is disabled.
If the V
the following happens:
• Volatile wiper registers may become corrupted
• TCON register may become corrupted
As the voltage recovers above the V
see Section 4.1.1 “Power-on Reset”.
Serial commands not completed due to a brown-out
condition may cause the volatile memory location to
become corrupted.
4.2
The device memory map supports 16 locations, of
which 3 locations are used. Each location is 9-bits wide
(16x9 bits). This memory space is shown in
TABLE 4-1:
4.2.1
There are four Volatile Memory locations. These are:
• Volatile Wiper 0
• Volatile Wiper 1
• Terminal Control (TCON) Register
• Reserved
The volatile memory starts functioning at the RAM
retention voltage (V
4.2.1.1
This memory location is Reserved and is mapped to
the Status Register of the Non-Volatile MCP45XX/
46XX devices. Since the Non-Volatile devices bits are
not used by the volatile device, this location is
reserved. Reading this address wil result in a value of
1F7h.
06h - 0Fh Reserved
Address
(Dual Resistor Network devices only)
00h
01h
02h
03h
04h
05h
DD
Memory Map
voltage decreases below the V
DD
POR
BROWN-OUT RESET
VOLATILE MEMORY (RAM)
Volatile Wiper 0
Volatile Wiper 1
Reserved
Reserved
Volatile TCON Register
Reserved
Address 05h (Reserved)
voltage decreases below the V
/V
BOR
MEMORY MAP
RAM
Function
voltage.
).
POR
DS22096A-page 37
Memory Type
/V
RAM
BOR
Table
RAM
RAM
RAM
RAM
POR
—
—
—
voltage
voltage
DD
/V
4-1.
BOR
will