2 digital section, Cdb5461au – Cirrus Logic CDB5461AU User Manual
Page 6
CDB5461AU
6
DS661DB1
1.2.2
Digital Section
The digital section contains the microcontroller, USB interface, JTAG header, reset circuitry, and an external inter-
face header (J40). The microcontroller interfaces the SPI of CS5461A with the USB connection to the PC, enabling
GUI software to access all the CS5461A registers and functions. Interface header, J40, is provided to allow the
CDB5461AU to be connected to an external energy registration device or an external microcontroller. To connect
the CS5461A to an external microcontroller, 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 an LED to indicate whether the CS5461A is 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
J24
J26
VIN± or IIN±
Selects External
Signal
VIN± or IIN±
Selects External
Signal
GND
Selects Grounding
the Input
VREFIN
Selects Reference
Source
Table 3. Voltage and Current Channel Input Signal Selection
O
VIN+
O O
VIN+
O O
VIN+
GND
VREF
VIN+
(Default)
O
VIN-
O O
VIN-
O O
VIN-
VIN-
VREF
GND
(Default)
O
IIN+
O O
IIN+
O O
IIN+
GND
VREF
IIN+
(Default)
O
IIN-
O O
IIN-
O O
IIN-
IIN-
VREF
GND
(Default)
O
VIN+
O O
VIN+
O O
VIN+
GND
VREF
VIN+
O
VIN-
O O
VIN-
O O
VIN-
VIN-
VREF
GND
O
IIN+
O O
IIN+
O O
IIN+
GND
VREF
IIN+
O
IIN-
O O
IIN-
O O
IIN-
IIN-
VREF
GND
O
VIN+
O O
VIN+
O O
VIN+
GND
VREF
VIN+
O
VIN-
O O
VIN-
O O
VIN-
VIN-
VREF
GND
O
IIN+
O O
IIN+
O O
IIN+
GND
VREF
IIN+
O
IIN-
O O
IIN-
O O
IIN-
IIN-
VREF
GND
O
VIN+
O O
VIN+
O O
VIN+
GND
VREF
VIN+
O
VIN-
O O
VIN-
O O
VIN-
VIN-
VREF
GND
O
IIN+
O O
IIN+
O O
IIN+
GND
VREF
IIN+
O
IIN-
O O
IIN-
O O
IIN-
IIN-
VREF
GND