ISM6636A&B_Rev1.10解密.pdf - 第32页

32 Innovision Semiconductor Preliminary Datas heet ISM6636 A/B Rev1.10 01/2023 Command Status Format unsigned binary Bit 7 6 5 4 3 2 1 0 Access R R R R R R R R Function Status_PG Status_OVP Status_OCP Status_OT P Status_…

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31
Innovision Semiconductor
Preliminary Datasheet
ISM6636A/B
Rev1.10 01/2023
Command
OT_Threshold
Format
unsigned binary
Bit
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R/W
R/W
Function
no use
OT_Threshold
Default
0
0
0
0
0
0
1
0
Table 25 Register = 0x19
Register = 0x1A Overvoltage protection behavior setting
(OV_Response)
This register can set the behavior of the module after overvoltage protection occurs and can
choose to latch off or not. When the user chooses to latch off (Register 0x1A Bit[0]=0), the
module will be latched off after the overvoltage protection behavior occurs, until the user
resets EN or re-enables the I2C Enable. When the user chooses not to latch (register 0x1A
Bit[0]=1), the module will attempt to restart after the overvoltage protection occurs.
Table 26 Register = 0x1A
Register = 0x21 Status monitoring (Status)
ISM6636X can read the current state of the device through the register. The specific
function description is as follows:
•
Bit[3]=1: When this bit is high, it means the module is in the enabled state. (EN pin = 1
and I2C Enable = 1).
•
Bit[4]=1: When this bit is high, it means that the module is in over temperature state.
This bit is 0 when the module is not in an overtemperature state.
• Bit[5]=1: When this bit is high, it means the module is in overcurrent state. When the
module is not in an overcurrent state, this bit is 0.
• Bit[6]=1: When this bit is high, it means the module is in overvoltage state. When the
module is not in an overvoltage state, this bit is 0.
• Bit[7]=1: When this bit is high, it means that the module is in normal working state, the
state logic is consistent with PG, but there is only one I2C interface.
When the protection occurs, the above status bits can help the user to check which
protection mechanism the module is in.
Command
OV_Response
Format
unsigned binary
Bit
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R/W
Function
no use
OV_Response
Default
0
0
0
0
0
0
0
0
32
Innovision Semiconductor
Preliminary Datasheet
ISM6636A/B
Rev1.10 01/2023
Command
Status
Format
unsigned binary
Bit
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
Function
Status_PG
Status_OVP
Status_OCP
Status_OTP
Status_Enable
no use
Default
0
0
0
0
1
0
0
0
Table 27 Register = 0x21
Register = 0x1D Unlock programming function (User_OTP_ON)
Register = 0x20 Burn times pointer (User_Pointer)
The ISM6636X will automatically load the default register values after power-on, and the
register value is stored in an OTP register. ISM6636X has 3 built-in OTP for upgrade use.
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.
•
Register address 0x20 [5:3] = 111 ; Indicates that the OTP has no available counts.
Command
User_Pointer
Format
unsigned binary
Bit
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
Function
no use
User_Pointer
no use
Default
0
0
0
0
1
0
0
0
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
33
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
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R/W
R
Function
no use
User_OTP_ON
no use
Default
0
0
0
0
1
0
0
0
Table 29 Register = 0x1D