SI4012 Просмотр технического описания (PDF) - Silicon Laboratories
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SI4012 Datasheet PDF : 50 Pages
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Si4012
4.4. Operating Mode Control
NOTE1, 2
TUNE with XO
5
TX_START
SHUTDOWN
1
SMBus or
SDN
(NOTE 4)
Yes
SDN=1?
NOTE1
No
STANDBY
2
Yes
CHANGE_STATE /
Tx_START
XO in CHIP_CONFIG?
No
CHANGE_STATE
SENSOR
3
TUNE without
XO
4
TX
6
NOTE1, 3
TX_START
NOTE1
NOTE1
Figure 3. State Machine Diagram
Transition Notes
1. Transition to any state (including SHUTDOWN) using the CHANGE_STATE command. Alternatively, transition to
SHUTDOWN using the SDN pin.
2. If a CHANGE_STATE command to the XO TUNE state is issued (even if already in the XO TUNE state), then an XO
TUNE operation is carried out immediately. This enables close control of timing (fastest execution) for a subsequent
TX_START command. In the TUNE state, a tune operation is carried out in the interval specified in TUNE_INTERVAL.
3. Transition to end state specified in the TX_START command or TX_STOP command.
4. If coming out of the SHUTDOWN via SMBus, an SMBus “wake-up” byte is required. This byte is discarded, and normal
SMBus communication can proceed after the power on reset (ipor) is asserted to the host.
State Descriptions
The Si4012 has six power modes, which are summarized below. Further details on the IC configuration in these
modes can be found in "5.1.5. COMMAND: CHANGE_STATE" on page 22.
SHUTDOWN—Lowest current consumption; the majority of hardware blocks are powered down.
STANDBY—Low power state with fast SMBus response.
SENSOR—Same as STANDBY, but the battery is measured periodically.
TUNE—Periodic tuning state. A tune is performed on any CHANGE_STATE to TUNE command and then
periodically based on the interval defined in TUNE_INTERVAL. This provides faster transition to TX. If XO is
enabled, XO will be used during tune operation.
TX—Transmission state.
Rev 1.1
11
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