MCP4651-503E/ST Microchip Technology, MCP4651-503E/ST Datasheet - Page 62

• 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

MCP453X/455X/463X/465X
7.7
The Decrement Command provide a quick and easy
method to modify the potentiometer’s wiper by -1 with
minimal overhead. The Decrement Command will only
function on the volatile wiper setting memory locations
00h and 01h.
When executing a Decrement Command, the volatile
wiper setting will be altered from n to n-1 for each
Decrement Command received. The value will
decrement down to 000h min. If multiple Decrement
Commands are received after the value has reached
000h, the value will not be decremented further.
Table 7-5
current volatile wiper value.
Refer to
sequence. The sequence is terminated by the Stop
condition. So when executing a continuous command
string, The Increment command can be followed by any
other valid command. this means that writes do not
need to be to the same volatile memory address.
The advantage of using an Decrement Command
instead of a read-modify-write series of commands is
speed and simplicity. The wiper will transition after each
Command Acknowledge when accessing the volatile
wiper registers.
FIGURE 7-8:
DS22096A-page 62
Note:
Note:
S
Decrement Wiper
Normal and High Voltage
Note 1:
0 1 0
shows the Increment Command versus the
Figure 7-8
Fixed
Address
Table 7-2
the Decrement Wiper command. Other
addresses are invalid.
The command sequence can go from an
increment to any other valid command for
the specified address.
2:
Control Byte
Decrement Command (DECR) only functions when accessing the volatile wiper
registers (AD3:AD0 = 0h and 1h).
This command sequence does not need to terminate (using the Stop bit) and can
change to any other desired command sequence (INCR, Read, or Write).
1
shows the valid addresses for
for the Decrement Command
I
2
A2 A1 A0 0
C Decrement Command Sequence.
Variable
Address
Write bit
A
AD AD AD AD
3
Device
Memory
Address Command
2
DECR Command (n-1)
1
0
1
0 X X A
TABLE 7-5:
7.7.1
The High Voltage Command (HVC) signal is
multiplexed with Address 0 (A0) and is used to indicate
that the command, or sequence of commands, are in
the High Voltage mode. Signals > V
HVC/A0 pin puts MCP45XX/46XX devices into High
Voltage mode.
The HVC pin has an internal resistor connection to the
MCP45XX/46XXs internal V
Current Wiper
3FFh
081h
080h
07Fh
041h
040h
03Fh
001h
000h
7-bit
Note:
Pot
Setting
AD AD AD AD
3FFh
101h
0FFh
080h
07Fh
8-bit
100h
000h
THE HIGH VOLTAGE COMMAND
(HVC) SIGNAL
There is a required delay after the HVC pin
is driven to the V
of the SCL pin.
4
Pot
081
001
3
DECR Command (n-2)
DECREMENT OPERATION VS.
VOLATILE WIPER VALUE
Reserved
(Full-Scale (W = A))
Full-Scale (W = A)
W = N
W = N (Mid-Scale)
W = N
Zero Scale (W = B) No
2
1
Properties
Wiper (W)
© 2008 Microchip Technology Inc.
1
DD
IHH
0 X X A P
signal.
level to the 1st edge
IHH
(~8.5V) on the
Yes
No
Yes
Decrement
Operates?
Command
(2)