MCP4162T-502I/SL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

MCP4162T-502I/SL

7/8-Bit Single/Dual SPI Digital POT with Volatile Memory

Microchip Technology 

MCP413X/415X/423X/425X

7.6 Read Data

Normal and High Voltage

Note:

The High Voltage Read Data command is

supported for compatability with system

that also support MCP414X/416X/424X/

426X devices.

The Read command is a 16-bit command. The format

of the command is shown in Figure 7-4.

The first 6-bits of the Read command determine the

address and the command. The 7th clock will output

the CMDERR bit on the SDO pin. The remaining

9-clocks the device will transmit the 9 data bits (D8:D0)

of the specified address (AD3:AD0).

Figure 7-4 shows the SDI and SDO information for a

Read command.

7.6.1 SINGLE READ

The read operation requires that the CS pin be in the

active state (VILor VIHH). Typically, the CS pin will be in

the inactive state (VIH) and is driven to the active state

(VILor VIHH). The 16-bit Read Command (Command

Byte and Data Byte) is then clocked in on the SCK and

SDI pins. The SDO pin starts driving data on the 7th bit

(CMDERR bit) and the addressed data comes out on

the 8th through 16th clocks. Figure 6-3 through

Figure 6-6 show possible waveforms for a single read.

Figure 6-5 and Figure 6-6 show the single read

waveforms when the SDI and SDO signals are

multiplexed on the same pin. For additional information

on the multiplexing of these signals, refer to

Section 6.1.3 “SDI/SDO”.

COMMAND BYTE

DATA BYTE

AAAA1 1XXXXXXXXXX

SDI D D D D

3210

SDO 1 1 1 1 1 1 1 D D D D D D D D D Valid Address/Command combination

876543210

1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 Attempted Memory Read of Reserved

Memory location.

FIGURE 7-4:

READ DATA

Read Command - SDI and SDO States.

© 2008 Microchip Technology Inc.

DS22060B-page 53

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