ISL98607

4. Application Information

FN8421 Rev.1.00

Page 20 of 29

Jun.3.19

4.14.2 Separate ENP and ENN pins (2 GPIO control)

Using two separate GPIO’s, and controlling the timing between the ENP and ENN pins, the turn on/off events can

be controlled. The method to control turn on/off by GPIO is valid when the respective enable bits in the ENABLE

register at Register Address 0x05 are set to ‘1’ (default). So, this method is used at IC power-ON (no I2C

communication is required).

By design, the VN regulator turns on 2ms after the ENN signal goes HIGH.

Figure 26 on page 21 shows a 5ms delay (example) between the ENP and ENN rise. VN turns on 2ms after ENN.

Figure 27 on page 21 shows a 5ms delay (example) between the ENP and ENN fall.

Figure 22. On-Sequence - I2C Control

Figure 23. Off-Sequence - I2C Control

Figure 24. I2C Sequence and VP Response

Figure 25. I2C Sequence and VP/VN Response

VP = 2V/Div

VN = 2V/Div

1ms/Div

VP

VN

0V

0V

-5V

+5V

VP = 2V/Div

VN = 2V/Div

1ms/Div

VP

VN

0V

0V

-5V

+5V

SCL = 2V/Div (DC)

SDA = 2V/Div (DC)

50µs/Div

VP = 1V/Div

VN = 1V/DV

0V

SCL = 2V/Div (DC)

SDA = 2V/Div (DC)

500µs/Div

VP = 1V/Div

VN = 1V/Div

-5V

0V

0V