7
REV. 1.0.0 XR20M1280 EVALUATION BOARD USER’S MANUAL
J44 Enable/Disable IR mode at power-up
(can be enabled/disabled in software after
power-up)
J44 in enables IR mode at power-up
J44 out disables IR mode at power-up
J50 SLEEP/PWRDN pin Header installed, no jumpers installed (default)
Refer to the datasheet for the behavior of this pin
J51 UART Reset input Jumper on 1&2 selects J2 as hardware reset
Jumper on 2&3 selects external reset from J9 pin 32 (default)
J10 I2C Address Select (A0)
■1&2 = VCC
■3&4 = SCL
■5&6 = SDA
■7&8 = GND
For I2C mode, only one jumper should be selected. See
XR20M1280 datasheet for I2C addressing.
For SPI mode, jumper should be out.
J11 I2C Address Select (A1)
■1&2 = VCC
■3&4 = SCL
■5&6 = SDA
■7&8 = GND
For I2C mode, only one jumper should be selected. See
XR20M1280 datasheet for I2C addressing.
For SPI mode, jumper should be out.
J9 Header for connection to external micro-
controller board
■Pin 23 = SDA signal for I2C
interface
■Pin 11 = SO signal for SPI
interface
■Pin 19 = IRQ# output signal from
XR20M1170
■Pin 15 = A0 signal for I2C interface
or CS# for SPI interface
■Pin 13 = A1 signal for I2C interface
or SI for SPI interface
■Pin 32 = RESET# input signal
■Pin 9 = SCK for SPI interface
(Jumper on J8 1&2)
■Pin 29 = SCL signal for I2C
interface or (Jumper on J9 2&3)
■Pin 5, 6, 7, 8, 31, 35 = GND signal
■Pin 34 & 36 = External +5V power
Ground and Power connections
■Pin 5, 6, 7, 8, 31 or 35 should be connected to GND
■Pin 34 or 36 should be connected +5V
If I2C interface is used (defaults for XR20M1280IL40-0A-EB):
■Pin 23 should be connected to SDA
■Pin 19 should be connected to MCU interrupt input (if using
interrupts)
■Pin 15 should be unconnected when using J10
■Pin 13 should be unconnected when using J11
■Pin 32 should be connected to the active low reset output
from the MCU
■Pin 29 should be connected to SCL
If SPI interface is used (defaults for XR20M1280IL40-0B-EB):
■Pin 23 should be unconnected
■Pin 11 should be connected to SO
■Pin 19 should be connected to MCU interrupt (if using
interrupts)
■Pin 15 should be connected to CS#
■Pin 13 should be connected to SI
■Pin 32 should be connected to the active low reset output
from the MCU
■Pin 9 should be connected to SCK
TABLE 5: JUMPER SETTINGS FOR XR20M1280IL40
JUMPERS FUNCTIONS COMMENTS
