STCF04 Datasheet, PDF (17/43 Pages) STMicroelectronics – Cell phones and smartphones

STCF04
Detailed description
Table 7. I²C address table
ADD pin
A7
A6
A5
A4
A3
A2
A1
A0
GND
0
1
1
0
0
0
0
R/W
VBAT
0
1
1
0
0
0
1
R/W
SDA
0
1
1
0
0
1
0
R/W
SCL
0
1
1
0
0
1
1
R/W
8.1.7
READY pin
This pin can be used to monitor the voltage on the SuperCap by the microprocessor. The
status of this pin has different meanings according to the current mode of operation of the
STCF04.
- Idle, Monitoring, Torch mode with TCHV_H=1:
The READY pin goes LOW when the SuperCap voltage reaches the threshold voltage set
by the V_DC register, otherwise the READY pin is HIGH when V_SuperCap goes below V_DC
voltage - 0.2 V of hysteresis. When READY is HIGH it means that it is necessary to recharge
the SuperCap in order to be able to make a flash.
- Torch mode with TCHV_H=0:
The READY pin goes LOW when the SuperCap reaches 4.2 V and is HIGH when the
SuperCap is below 4.2 V and Torch mode is not active.
- FLASH:
The READY pin goes LOW as soon as the SuperCap voltage reaches the threshold voltage
set by the V_DC register. It stays LOW until the SuperCap voltage decreases below 4.2 V and
Flash mode is not active. This feature allows the user to perform multiple flashes.
See Figure 4 below for details.
Figure 4. Behavior of the READY pin in different modes
Doc ID 022927 Rev 3
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