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Si1141/42/43
3. Operational Modes
The Si1141/42/43 can be in one of many operational modes at any one time. It is important to consider the
operational mode since the mode has an impact on the overall power consumption of the Si1141/42/43. The
various modes are:
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Off Mode
Initialization Mode
Standby Mode
Forced Conversion Mode
Autonomous Mode
3.1. Off Mode
The Si1141/42/43 is in the Off Mode when V DD is either not connected to a power supply or if the V DD voltage is
below the stated VDD_OFF voltage described in the electrical specifications. As long as the parameters stated in
Table 4, “Absolute Maximum Limits,” on page 9 are not violated, no current will flow through the Si1141/42/43. In
the Off Mode, the Si1141/42/43 SCL and SDA pins do not interfere with other I 2 C devices on the bus. The LED pins
will not draw current through the infrared diodes. Keeping V DD less than VDD_OFF is not intended as a method of
achieving lowest system current draw. The reason is that the ESD protection devices on the SCL, SDA and INT
pins also from a current path through V DD . If V DD is grounded for example, then, current flow from system power to
system ground through the SCL, SDA and INT pull-up resistors and the ESD protection devices.
Allowing V DD to be less than VDD_OFF is intended to serve as a hardware method of resetting the Si1141/42/43
without a dedicated reset pin.
The Si1141/42/43 can also reenter the Off Mode upon receipt of either a general I 2 C reset or if a software reset
sequence is initiated. When one of these software methods is used to enter the Off Mode, the Si1141/42/43
typically proceeds directly from the Off Mode to the Initialization Mode.
3.2. Initialization Mode
When power is applied to V DD and is greater than the minimum V DD Supply Voltage stated in Table 1,
“Recommended Operating Conditions,” on page 4, the Si1141/42/43 enters its Initialization Mode. In the
Initialization Mode, the Si1141/42/43 performs its initial startup sequence. Since the I 2 C may not yet be active, it is
recommended that no I 2 C activity occur during this brief Initialization Mode period. The “Start-up time” specification
in Table 1 is the minimum recommended time the host needs to wait before sending any I 2 C accesses following a
power-up sequence. After Initialization Mode has completed, the Si1141/42/43 enters Standby Mode. The host
must write 0x17 to the HW_KEY register for proper operation.
3.3. Standby Mode
The Si1141/42/43 spends most of its time in Standby Mode. After the Si1141/42/43 completes the Initialization
Mode sequence, it enters Standby mode. While in Standby Mode, the Si1141/42/43 does not perform any Ambient
Light measurements or Proximity Detection functions. However, the I 2 C interface is active and ready to accept
reads and writes to the Si1141/42/43 registers. The internal Digital Sequence Controller is in its sleep state and
does not draw much power. In addition, the INT output retains its state until it is cleared by the host.
I 2 C accesses do not necessarily cause the Si1141/42/43 to exit the Standby Mode. For example, reading Si1141/
42/43 registers is accomplished without needing the Digital Sequence Controller to wake from its sleep state.
3.4. Forced Conversion Mode
The Si1141/42/43 can operate in Forced Conversion Mode under the specific command of the host processor. The
Forced Conversion Mode is entered if either the ALS_FORCE or the PS_FORCE command is sent. Upon
completion of the conversion, the Si1141/42/43 can generate an interrupt to the host if the corresponding interrupt
is enabled. It is possible to initiate both an ALS and multiple PS measurements with one command register write
access by using the PSALS_FORCE command.
Rev. 1.3
17
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