stmpe1600 STMicroelectronics, stmpe1600 Datasheet - Page 18

• Manufacturer Part Number: stmpe1600
• Description: 16-bit Port Expander With Ultra-low Power Consumption Xpander Logictm
• Manufacturer: STMicroelectronics

Polarity inversion register
9.3
18/26
Fail safe conditions
The STMPE1600 IOs (SDA, SCL, INT, A2, A1, A0) are fail-safe IOs that support 4 mA
current drive.
Table 10.
Note that “present” state implies that the supply is present. The “absent” state implies that
the power is lost (grounded) condition. In the fail-safe condition, the leakage current flowing
into the STMPE1600 device is prevented.
Fail Safe condition
When chip supply is 0 V and when V
as a fail-safe condition. In this case, the chip is protected and the current per I/O is limited to
a very small value.
Over-voltage condition
The second condition is the over-voltage condition which occurs when V
V
and 25
So it is recommended to operate the IO at the same voltage as the supply voltage (either
1.8 V or 3.3 V). Also the fail safe IOs are special IOs which can have a voltage present while
the supply voltage V
voltage V
Present
Absent
IO
= 3.6 V. In this condition, the current drawn by the device per IO can be 10
µ
A (worst case). This device should not be operated under this condition.
CC
V
CC
is 0 V.
Fail safe conditions
(core and IO supply)
CC
is 0 V. Current will be limited from the fail safe IOs when supply
Doc ID 16938 Rev 1
IO
(SDA, SCL, INT, A2, A1, A0) is 3.6 V, this is classified
Normal operating condition
Complete power-down condition
Condition
CC
= 1.65 V and
STMPE1600
µ
A (typical)