TSC2007_17 Datasheet, PDF (31/41 Pages) Texas Instruments – 1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire Micro TOUCH SCREEN CONTROLLER with I2C Interface

TSC2007
www.ti.com...................................................................................................................................................... SBAS405A – MARCH 2007 – REVISED MARCH 2009
POWER-ON RESET (POR)
During TSC2007 power-up, an internal power-on reset (POR) is automatically implemented. The POR brings the
TSC to the default working condition, and checks the A0 and A1 pins for the two LSBs of the I²C address. The
TSC2007 senses the power-up curve to decide whether or not to implement a POR.
It is required to follow the power-on/off slope and interval requirements, as provided in the Electrical
Characteristics, in order to ensure a proper POR of the TSC2007.
1.2V to 3.6V
0.9V
t_{VDD_OFF_RAMP}
t_{VDD_ON_RAMP}
V_DD
0.3V
0V
t_{VDD_OFF}
Figure 35. Power-On Reset Timing
Table 7. Timing Requirements for Figure 35
PARAMETER
V_DD off ramp
V_DD off time
V_DD on ramp
TEST CONDITIONS
T_A = –40°C to +85°C
T_A = –40°C to +85°C, V_DD = 0V
T_A = –20°C to +85°C, V_DD = 0V
T_A = –40°C to +85°C
MIN MAX UNIT
2
kV/s
1.2
s
0.3
s
12
kV/s
1.4
1.2
1.0
Recommended V_DD Off Time
0.8
for T_A = -40°C to +85°C
0.6
0.4
0.2
Typical V_DD Off Time for Various Temperatures
0
-40 -20
0
20
40
60
80 100
Temperature (°C)
Figure 36. V_DD Off Time vs Temperature
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