RT5035A/B
And then EN goes low, IC will get into standby mode with CH1 and CH10 operating in PFM mode.
If BAT > 2.8V is guaranteed, SHDN_EN1 could be 0 to save electricity in standby mode.
As for back to shutdown mode, EN goes high, and to set I2C registers back to shutdown mode (SHDN_EN10 = 0
and SHDN_EN1 = 0 for Li battery. SHDN_EN10 = 0 and SHDN_EN1 keeps 1 for 2AA) and then EN goes low finally.
Power Sequence with Delay Time
The start point referred by ENDLYx delay time begins when the EN pin goes high. For instance, A14.EN8 = 1, CH8
turns on immediately.
EN Pin
A7.EN8
CH8 V
OUT
I2C Register Information
The RT5035A/B I2C interface power must be supplied by either VOUT2 or an equal potential node. If
= Low,
RESET
I2C read/write can not function. The RT5035A/B I2C slave address = 0011000 (7bits). I2C interface supports fast
mode (bit rate up to 400kb/s). The write or read bit stream (N ³1) is shown below :
SDA
t
LOW
t
t
t
F
t
SP
SU;DAT
t
HD;STA
t
F
R
t
R
t
BUF
SCL
t
t
t
SU;STO
HD;STA
SU;STA
t
t
HIGH
HD;DAT
S
P
S
S
r
Read N bytes from RT5035
Slave Address
Register Address
Slave Address
MSB
MSB
Data 1
LSB
S
0
A
A
Sr
1
A
A
R/W
Assume Address = m
MSB Data 2
Data for Address = m
LSB
LSB
Data N
A
A
P
Data for Address = m+N-1
Data for Address = m+1
Register Address
Write N bytes to RT5035
Slave Address
MSB
Data 1
LSB MSB
A
Data 2
LSB
S
0
A
A
A
Assume Address = m
Data for Address = m
MSB
Data for Address = m+1
LSB
R/W
Data N
A
P
Data for Address = m+N-1
P Stop, S Start, Sr Repeat Start
Driven by Master,
Driven by Slave (RT5035),
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26
DS5035A/B-03 February 2020
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
