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Application Note
BD71837MWV Platform Design Guide
© 2018 ROHM Co., Ltd.
No. 61AN002E Rev.001
May.2018
5.7. Interfaces
I2C interface is selected for the communication between PMIC and SoC.
5.7.1. I2C
Table 5.13 Schematic checklist of I2C
Pin Names
Dir.
Signal
Voltage
Level
System
Pull-up/Pull-down
(RTT)
Termination
if it is not
used
Notes
Check
I2C
DVDD
I
-
-
-
The input power source for
C32K_OUT and I2C interface.
Capacitor for decoupling, use
one
1.0μF
± 20%
(size : 1005, capacitance : 1.0μF,
tolerance : 6.3V)
SCL
I
DVDD
Pulled up to DVDD
with 1kohm
-
Connect to SoC (Note)
If pull up resistor is prepared within
SoC,
the additional pull up resistor is not
needed.
SDA
I/O
DVDD
Pulled up to DVDD
with 1kohm
-
Connect to SoC (Note)
If pull up resistor is prepared within
SoC,
the additional pull up resistor is not
needed.
Note: Recommended to use LDO1 (NVCC_SNVS) as power source for DVDD.
If DVDD is not used as the pull up voltage for SCL and SDA, it's recommended to use NVCC_I2C in SoC as the pull up voltage.
