3
Rev. 0
JUMPERS
USING OTHER SPI MASTER BOARDS
DC2515 SERIAL INTERFACE OPTIONS
The on-board jumpers must be set to match the desired
mode of operation. These jumpers can enable the Dis-
charge Timer and select the serial communication mode
of the battery stack monitor IC.
ISOMD Jumpers JP1, JP2, and JP4
0: Set jumpers to 0 for standard SPI communication to
the IC through the J4 connector.
1: Set jumpers to 1 for isoSPI communication to the IC
through either the J1 or J2 connector.
DTEN Jumper JP3
0: Set jumpers to 0 for Discharge Timer disable.
1: Set jumpers to 1 for Discharge Timer enable.
The DC2515 has several communication options. The
DC2026 Linduino One provides a USB-to-SPI interface,
and is ideal to interface from a PC to any SPI device. In
this case, the DC2026 SPI interface can connect directly
to the DC2515 (see section entitled DC2026 to DC2515
SPI Connection for details). Alternately, the DC2026 SPI
can be translated to isoSPI via the DC1941 (single isoSPI
channel) or DC2792 (dual isoSPI channels) demo boards.
The DC2792 dual master isoSPI demo board can be con-
nected as a typical single-ended isoSPI bus master or to
both ends of a reversible configuration with two isoSPI
bus masters. The DC1941 can be connected as a typical
single-ended isoSPI bus master.
When a different SPI Master microcontroller board is used
instead of the DC2026, more components or equipment
are required to properly interface to the demo boards.
Here are the requirements:
SPI MISO Line
Most SPI Master microcontroller boards will not have a
SPI MISO line pull-up. A 5kΩ pull-up resistor is required
on the SPI MISO line because the battery stack monitor
IC SDO is an open drain NMOS output pin. Otherwise,
the SPI MISO line will be floating where the SPI readback
of each byte will typically appear as no response or all
one’s or 0xFF’s. There are several places where the pull-up
resistor can be installed. On the microcontroller board, a
5kΩ resistor can be added between the microcontroller
SPI MISO line and the microcontroller VCC pin.
isoSPI IC Power
A separate 5V power supply is required when using a
different SPI Master microcontroller board. The DC2026
J1 header provides power for the isoSPI IC through the
14-pin ribbon cable into the DC2792 J1 header or the
DC1941 J2 header. Refer to demo manual DC2792A
or demo manual DC1941D for external power supply
instructions.