MT9V115
CONFIDENTIAL AND PROPRIETARY
NOT FOR PUBLIC RELEASE
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7
Figure 3. Hard Standby Mode Operation
EXTCLK
STANDBY
Mode
t
1
t
2
t
4
t
3
STANDBY
Asserted
Standby
Mode
EXTCLK Disabled
EXTCLK Enabled
NOTE: In hard standby mode, EXTCLK is automatically gated off, and the two-wire serial interface is not active.
Table 6. HARD STANDBY SIGNAL TIMING
Symbol Parameter Min Typ Max Unit
t
1 Standby entry complete (EOF hard standby) 1 Frame + 16742 – 1 Frame + 17032 EXTCLKs
t
2 Active EXTCLK required after STANDBY as-
serted
10 – – EXTCLKs
t
3 Active EXTCLK required before STANDBY
de-asserted
10 – – EXTCLKs
t
4 STANDBY pulse width 1 Frame + 16762 – – EXTCLKs
Soft Standby Mode
The MT9V115 can enter soft standby mode by writing to
a SYSCTL register through the two-wire serial interface, as
shown in Figure 4. EXTCLK can be stopped to reduce the
power consumption during soft standby mode. However,
since two-wire serial interface requires EXTCLK to operate,
ON Semiconductor recommends that EXTCLK run
continuously.
Entering Standby Mode
1. Set SYSCTL 0x0018[0] to “1” to initiate standby
mode.
2. Check until SYSCTL 0x0018[14] changes to “1”
to indicate MT9V115 is in standby mode.
3. Turn EXTCLK off.
Exiting Standby Mode
1. Turn EXTCLK on.
2. Reset SYSCTL register 0x0018[0] to “0.”
3. Check until SYSCTL register 0x0018[14] changes
to “0”.
NOTE: Steps 1 is only necessary in soft standby mode if
EXTCLK is turned off.
Figure 4. Soft Standby Mode Operation
EXTCLK
SYSCTL 0x0018[0]
Mode
t
1
t
2
t
4
t
3
STANDBY
Asserted
Standby
Mode
EXTCLK Disabled
EXTCLK Enabled