MCP3903T-E/SS Microchip Technology, MCP3903T-E/SS Datasheet - Page 32

• Manufacturer Part Number: MCP3903T-E/SS
• Description: Six Channel Energy Meter Front End, SPI Interface 28 SSOP .209in T/R
• Manufacturer: Microchip Technology
• Series: -r

Specifications of MCP3903T-E/SS

• Number Of Bits: 24
• Number Of Channels: 6
• Power (watts): -
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 2.7 V ~ 3.6 V
• Package / Case: 28-SSOP (0.209", 5.30mm Width)
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP3903
FIGURE 6-5:
6.7
If the user wishes to read back any of the ADC
channels continuously, or all channels continuously,
the internal address counter of the MCP3903 can be
set to loop on specific register sets. In this case, there
is only one control byte on SDI to start the
communication. The part stays within the same loop
until CS returns high.
This internal address counter allows the following
functionality:
• Read one ADC channel data continuously
• Read all ADC channel data continuously (all ADC
• Read continuously the entire register map
• Read continuously each separate register
• Read continuously all configuration registers
• Write all configuration registers in one
FIGURE 6-6:
DS25048B-page 32
data can be independent or linked with
DRn_MODE settings)
communication (see
SDO
SCK
SDI
CS
Read Continuously Channel Data,
LOOPING ON ADDRESS SETS
BITS ON THE RISING EDGE
MCU AND MCP3901 LATCH
DATA TRANSITIONS ON
THE FALLING EDGE
HI-Z
Device Write (SPI Mode 1,1 - Clock Idles High).
Typical Continuous Read Communication.
Figure
1
A6 A5 A4 A3 A2 A1
6-6)
A0
CH5
R/W
CH5
23
(ADDRESS) DATA
22
5
21
20 19 18
HI-Z
The STATUS/COM register contains the loop settings
for the internal address counter (READ<1:0>). The
internal address counter can either stay constant
(READ<1:0>=00) and continuously read the same
byte, or it can auto-increment and loop through the
register groups defined below (READ<1:0>=01),
register types (READ<1:0>=10) or the entire register
map (READ<1:0>=11).
Each channel is configured independently as either a
16-bit or 24-bit data word, depending on the setting of
the corresponding WIDTH bit in the CONFIG register.
For continuous reading, in the case of WIDTH=0
(16-bit), the lower byte of the ADC data is not accessed
and the part jumps automatically to the following
address (the user does not have to clock out the lower
byte since it becomes undefined for WIDTH=0).
The following figure represents a typical continuous
read communication with the default settings
(DRMODE<1:0>=00, READ<1:0>=10) for both
WIDTH settings. This configuration is typically used for
power metering applications.
17
D16
D08
D7
D6 D5 D4 D3 D2 D1
CH5
© 2011 Microchip Technology Inc.
CH5
32
D0
5
HI-Z