ISM6636A&B_Rev1.10解密.pdf - 第33页

33 Innovision Semiconductor Preliminary Datas heet ISM6636 A/B Rev1.10 01/2023 and compa re it with the data in ste p 4 to verify the d ata. If th e d ata is consistent, the programming is successf ul. If it is incon sis…

Innovision Semiconductor

Preliminary Datasheet

ISM6636A/B

Rev1.10 01/2023

Command

Status

Format

unsigned binary

Bit

Access

Function

Status_PG

Status_OVP

Status_OCP

Status_OTP

Status_Enable

no use

Default

Table 27 Register = 0x21

The ISM6636X will automatically load the default register values after power-on, and the

The factory defaults to use once, and the user can operate OTP to burn twice. The number

of times that can be programmed is recorded in register address 0x20 Bit [5:3]:

• Register address 0x20 [5:3] = 001 ; Indicates that OTP can be written twice, the

factory default.

• Register address 0x20 [5:3] = 011 ; Indicates that OTP can be written once more.

•

Command

User_Pointer

Format

unsigned binary

Bit

Access

Function

no use

User_Pointer

no use

Default

Table 28 Register = 0x20

If the user needs to reconfigure and modify the default registers, the following steps can be

followed.

1. Set EN pin voltage low. Leave the module in an off state.

2. Make sure that the VIN or VCC voltage is normally powered.

3. To read the value of register 0x20 Bit [5:3], it is necessary to ensure that at least one

Bit = 0. If all are 1, it means that there are no available programming times, and the

operation is aborted.

4. Write the data to be modified into the register.

5. Write 0x02 to the register address 0x1D to unlock the programming function. After

power-on, the address 0x1D Bit[1] defaults to 0 to prevent user misoperation.

6. Write the command 0x15 to the register address 0x2B, the programming instruction

is executed, and the module will write the set value of the register into the new OTP mode.

7. Wait for 1 second. Do not power off VIN or VCC voltage while programming is in

progress.

8. After 1 second, the module programming is successful.

9. Restart the module (VIN and VCC are powered off to 0V and then powered on), at

this time the module will load the new OTP data into the register. Read the register data

Innovision Semiconductor

Preliminary Datasheet

ISM6636A/B

Rev1.10 01/2023

and compare it with the data in step 4 to verify the data. If the data is consistent, the

programming is successful. If it is inconsistent, perform steps 1~9 again.

Note: After performing step 8, the programming is successful. Users can choose to perform

step 9 for data verification to prevent system failures caused by external interference during

the programming process. The data loading of the OTP into the register will only be

performed after the VCC voltage reaches the start-up threshold voltage.

Command

User_OTP_ON

Format

unsigned binary

Bit

Access

R/W

Function

no use

User_OTP_ON

no use

Default

Table 29 Register = 0x1D

Innovision Semiconductor

Preliminary Datasheet

ISM6636A/B

Rev1.10 01/2023

PCB Layout Guidelines

Efficient PCB layout is crucial to the stable operation of the circuit. For best performance,

refer to the figure in the PCB layout column and follow the PCB layout recommendations

below.

1. The input (output) MLCC capacitor shall be as close as possible to the VIN and

PGND(VOUT and PGND) pins and the main MLCC capacitor shall be placed on the

same wiring layer as ISM6636X. The copper plane of VIN,PGND,VOUT can be

maximized to minimize the parasitic impedance.

2. VCC and VIN capacitor should be placed as close to the ISM6636X as possible.

Connect PGND .

3. Place as many PGND holes as possible nearest to the PGND pin to minimize parasitic

impedance and thermal resistance.

4. AGND is connected to the PGND shortest path.

5. The VOS pin is far away from the interference source and connected to the remote

Vout capacitor.

Recommended Land Pattern Recommended PCB layout