CDB5466U

DS676DB1

5

to position VIN+, J22 to position VN-, J24 to position IIN+ and J26 to position IIN-, the input voltage signal is supplied

from the screw terminals J23 and J27. With a jumper on J17, J22, J24 and J26 in the GND position, the inputs are

connected to analog ground (AGND). With a jumper on J17, J22, J24 and J26 in position

nected to the reference voltage selected on J12.

1.2.2

Digital Section

The digital section contains the microcontroller, USB interface, JTAG header, reset circuitry, and an external inter-

face header (J11). The microcontroller interfaces the energy pulses, E1, E2, and FOUT output by the CS5466 with

the USB connection to the PC. The microcontroller also provides a hardware reset to the CS5466, which is level

shifted to support both +3.3 V and +5 V digital operation. Interface header, J11, is provided to allow the CDB5466U

to be connected to an external energy registration device. The energy output pins E1, E2, FOUT and NEG are routed

to LEDs which provide a simple visual check of the energy output pulses. Jumpers J10, J13, J15 and J16 are

equipped at the factory with jumpers to enable the LEDs.

1.2.2.1

Current Channel Gain

To accommodate different current-sensing elements the current channel incorporates a programmable gain that can

be set to one of four input ranges. Input pins IGAIN1 and IGAIN0 define the four gain selections and corresponding

maximum input signal level. Jumpers J31 and J32 define the state of IGAIN1 and IGAIN0, respectively. Table 4 il-

lustrates the options available. With jumpers J31 = J32 = GND the gain is set to 10x. With jumpers J31 = GND and

J32 = VD+ the gain is set to 50x. With jumpers J31 = VD+ and J32 = GND the gain is set to 100x. With jumpers

J31 = VD+ and J32 = VD+ the gain is set to 150x.

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

GND

VREF

VIN+

(Default)

VIN-

VREF

GND

(Default)

GND

VREF

IIN+

(Default)

IIN-

VREF

GND

(Default)

GND

VREF

VIN+

VIN-

VREF

GND

GND

VREF

IIN+

IIN-

VREF

GND

GND

VREF

VIN+

VIN-

VREF

GND

GND

VREF

IIN+

IIN-

VREF

GND

O

O

GND

VREF

VIN+

O

O

VIN-

VREF

GND

O

O

GND

VREF

IIN+

O

O

IIN-

VREF

GND