PAC7640 Product Datasheet
Enhanced QE Global Shutter Image Sensor
PixArt Imaging Inc.
5.0 Power States
Table 11. Operational States
States
OFF
Functional Description
No power supply, all the voltage rails and clocks are gated.
RESET
This mode is entered when power-up sequence is executed and RESETB is held low. The
sensor stays in this state as long as RESETB is held low. High on RESETB will transition the
sensor to Ready mode. After power up, when the sensor is waiting for RESETB to go high, all
the rails to the individual functional blocks shall be internally gated. Any time the RESETB is
pulled low the sensor shall enter this mode.
The sensor is transitioned to this mode when RESETB is set to high. This mode can be thought
of as a mode for re-initialization of the registers if they are different from the default register
settings. All the rails and clocks are enabled. There is no capture or transmission of data on
the MIPI lanes. All the functional blocks are enabled. Transition to Sleep can be triggered
when a pre-programmed timer expires.
The sensor will enter this mode when streaming is enabled by setting R_MODE_SELECT = 1 in
the ready state. The sensor will capture image and the data is transmitted on the MIPI lanes
based on the settings for readout. Frame rate can be changed to any frame rate within design
limitation. All the power rails and clocks are enabled as required. R_MODE_SELECT = 0
transitions the sensor back to the Ready mode. Various configurations for Stream mode like
readout and synchronization settings. See more details from operation examples.
In FOD the capture and transmission happens in response to an I/O that is controlled by the
host. Transition to this state from a ready state happens when R_MODE_SELECT = 3. The
FOD_TRI is configures as input before the transition. This is very similar to stream state and
the only delta is in the number of frames being transmitted. In the stream state the frames
are continuously transmitted based on a certain frame rate. In FOD mode even though the
capture happens at the same frame rates only a few frames are captured and transmitted.
The number of frames, N(up to 100), to be transmitted is programmable. While the sensor is
in this mode it is waiting for a rising edge, minimum 1us hold time, on the FOD_TRI pin to
begin the capture and transmission of N frames. The sensor shall transition back to ready
state when R_MODE_SELECT = 0.
READY1
STREAM1,2,3
FOD1,2,3
(Frame ON Demand)
SLEEP1
Notes:
This mode is entered from Ready mode either by using I2C or autonomously. When I2C is used
the user will transition anytime by setting R_SW_PowerDown_EnH = 1. In autonomous
transition happens when the timer, R_Sleep_Timer, expires. The sensor stays in this mode
until the user transitions back to Ready mode by setting R_SW_PowerDown_EnH = 0. The
MIPI and image capture are disabled. All the register settings initialized during the Ready
mode are retained.
1. Transition relative registers: Bank0: 0x09, 0x10, 0x14, 0x15, 0x16, 0x6D.
2. Synchronization relative registers: Bank0: 0x0B, 0x11
3. Readout relative registers: Bank1: 0x28, 0x29, 0x2A
Version 1.1 | 11 Sep 2015 | 41002EN
PixArt Imaging Inc. http://www.pixart.com
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PIXART [ PIXART IMAGING INC. ]
