MCP42010-I Datasheet, PDF (1/32 Pages) Microchip Technology – Single/Dual Digital Potentiometer with SPI Interface

M
MCP41XXX/42XXX
Single/Dual Digital Potentiometer with SPI^™ Interface
Features
• 256 taps for each potentiometer
• Potentiometer values for 10 kΩ, 50 kΩ and
100 kΩ
• Single and dual versions
• SPI™ serial interface (mode 0,0 and 1,1)
• ±1 LSB max INL & DNL
• Low power CMOS technology
• 1 µA maximum supply current in static operation
• Multiple devices can be daisy-chained together
(MCP42XXX only)
• Shutdown feature open circuits of all resistors for
maximum power savings
• Hardware shutdown pin available on MCP42XXX
only
• Single supply operation (2.7V - 5.5V)
• Industrial temperature range: -40°C to +85°C
• Extended temperature range: -40°C to +125°C
Block Diagram
V_DD
V_SS
Control
Logic
RS SHDN
Wiper
Register
PB0
Resistor
Array 0
PA0
PW0
CS
SI
SCK
16-Bit
Shift
Register
Wiper Resistor
Register Array 1*
S0
PB1
PA1
PW1
*Potentiometer P1 is only available on the dual
MCP42XXX version.
Description
The MCP41XXX and MCP42XXX devices are 256-
position, digital potentiometers available in 10 kΩ,
50 kΩ and 100 kΩ resistance versions. The
MCP41XXX is a single-channel device and is offered in
an 8-pin PDIP or SOIC package. The MCP42XXX con-
tains two independent channels in a 14-pin PDIP, SOIC
or TSSOP package. The wiper position of the
MCP41XXX/42XXX varies linearly and is controlled via
an industry-standard SPI interface. The devices con-
sume <1 µA during static operation. A software shut-
down feature is provided that disconnects the “A”
terminal from the resistor stack and simultaneously con-
nects the wiper to the “B” terminal. In addition, the dual
MCP42XXX has a SHDN pin that performs the same
function in hardware. During shutdown mode, the con-
tents of the wiper register can be changed and the
potentiometer returns from shutdown to the new value.
The wiper is reset to the mid-scale position (80h) upon
power-up. The RS (reset) pin implements a hardware
reset and also returns the wiper to mid-scale. The
MCP42XXX SPI interface includes both the SI and SO
pins, allowing daisy-chaining of multiple devices. Chan-
nel-to-channel resistance matching on the MCP42XXX
varies by less than 1%. These devices operate from a
single 2.7 - 5.5V supply and are specified over the
extended and industrial temperature ranges.
Package Types
PDIP/SOIC
CS 1
SCK 2
SI ₃
V_{SS 4}
8 V_DD
7 PB0
6 PW0
5 PA0
PDIP/SOIC/TSSOP
CS 1
SCK 2
SI 3
V_SS 4
PB1 5
PW1 6
PA1 7
14 V_DD
13 SO
12 SHDN
11 RS
10 PB0
9 PW0
8 PA0
 2003 Microchip Technology Inc.
DS11195C-page 1