4 digital section, Cdb5464u – Cirrus Logic CDB5464U User Manual
Page 5
CDB5464U
DS847DB1
5
the inputs are connected to analog ground (AGND). With a jumper on J17, J22, J24, J26, J20, and J19 in
position VREF, the inputs are connected to the reference voltage selected on J12.
1.4
Digital Section
The digital section contains the microcontroller, USB interface, JTAG header, reset circuitry, and an ex-
ternal interface header (J40). The microcontroller interfaces the SPI of CS5464 with the USB connection
to the PC, enabling the GUI software to access all the CS5464 registers and functions. Interface header,
J40, is provided to allow the CDB5464U to be connected to an external energy registration device or an
external microcontroller. To connect the CS5464 to an external microcontroller, R57, R58, R59, R60, R61,
and R62 must be removed from the board. The energy output pins E1, E2, and E3 are routed to LEDs
which provide a simple visual check of the energy output pulses. The MODE pin is also routed to a LED
to indicate whether the CS5464 is operating in auto-boot mode. Jumpers J10, J13, J15, and J16 are
equipped at the factory with jumpers to enable the LEDs.
INPUT
Description
J17
J22
VIN2± or VIN1±
Selects External
Signal
VIN2± or VIN1±
Selects External
Signal
GND
Selects Grounding
the Input
VREFIN
Selects Reference
Source
INPUT
Description
J24
J26
J20
J19
IIN1± or IIN2±
Selects External
Signal
IIN1± or IIN2±
Selects External
Signal
GND
Selects Grounding
the Input
VREFIN
Selects Reference
Source
Table 3. Voltage and Current Channel Input Signal Selection
O
VIN1-
O O
VIN1-
O O
VIN1-
GND
VREF
VIN1-
(Default)
O
VIN1+
O O
VIN1+
O O
VIN1+
VIN1+
VREF
GND
(Default)
O
VIN1-
O O
VIN1-
O O
VIN1-
GND
VREF
VIN1-
O
VIN1+
O O
VIN1+
O O
VIN1+
VIN1+
VREF
GND
O
VIN1-
O O
VIN1-
O O
VIN1-
GND
VREF
VIN1-
O
VIN1+
O O
VIN1+
O O
VIN1+
VIN1+
VREF
GND
O
VIN1-
O O
VIN1-
O O
VIN1-
GND
VREF
VIN1-
O
VIN1+
O O
VIN1+
O O
VIN1+
VIN1+
VREF
GND
O
IIN1+
O O
IIN1+-
O O
IIN1+
GND
VREF
IIN1+
(Default)
O
IIN1-
O O
IIN1-
O O
IIN1-
IIN1-
VREF
GND
(Default)
O
IIN2+
O O
IIN2+
O O
IIN2+
GND
VREF
IIN2+
(Default)
O
IIN2-
O O
IIN2-
O O
IIN2-
IIN2-
VREF
GND
(Default)
O
IIN1+
O O
IIN1+-
O O
IIN1+
GND
VREF
IIN1+
O
IIN1-
O O
IIN1-
O O
IIN1-
IIN1-
VREF
GND
O
IIN2+
O O
IIN2+
O O
IIN2+
GND
VREF
IIN2+
O
IIN2-
O O
IIN2-
O O
IIN2-
IIN2-
VREF
GND
O
IIN1+
O O
IIN1+-
O O
IIN1+
GND
VREF
IIN1+
O
IIN1-
O O
IIN1-
O O
IIN1-
IIN1-
VREF
GND
O
IIN2+
O O
IIN2+
O O
IIN2+
GND
VREF
IIN2+
O
IIN2-
O O
IIN2-
O O
IIN2-
IIN2-
VREF
GND
O
IIN1+
O O
IIN1+-
O O
IIN1+
GND
VREF
IIN1+
O
IIN1-
O O
IIN1-
O O
IIN1-
IIN1-
VREF
GND
O
IIN2+
O O
IIN2+
O O
IIN2+
GND
VREF
IIN2+
O
IIN2-
O O
IIN2-
O O
IIN2-
IIN2-
VREF
GND