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LP3936SLX Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LP3936SLX Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 20 page I 2C Compatible Interface (Continued) I 2C Timing Parameters V DD1, 2 = 3.0V to 4.5V, VDD_IO = 1.8V to VDD1, 2 Symbol Parameter Limits Units Min Max 1 Hold Time (repeated) START Condition 0.6 µs 2 Clock Low Time 1.3 µs 3 Clock High Time 600 ns 4 Setup Time for a Repeated START Condition 600 ns 5 Data Hold Time 300 900 ns 6 Data Setup Time 100 ns 7 Rise Time of SDA and SCL 20 + 0.1C b 300 ns 8 Fall Time of SDA and SCL 15 + 0.1C b 300 ns 9 Set-Up Time for STOP Condition 600 ns 10 Bus Free Time between a STOP and a START Condition 1.3 µs C b Capacitive Load for Each Bus Line 10 200 pF Note: Data guaranteed by design. A/D Converter for Ambient Light Measurement Electrical Characteristics Symbol Parameter Conditions Min Typ Max Units V IN RANGE Input Voltage AD Output: 00h 1.23 V AD Output: FFh 2.46 V DNL Differential Non-Linearity –1.5 ±1 +1.5 LSB GE Gain Error −5 +5 LSB PSS Power Supply Sensitivity 3.1V ≤ V DD ≤ 4.2V ±1/2 LSB f(conv) Conversion Rate Without Averaging 217 Hz With Averaging (64 samples) 3.4 Hz t STARTUP Startup Time 100 ms I AIN Input Current 1.23 < AIN < 2.6V ±0.1 µA I AREF Maximum Output Current AREF Output Current Sink 200 µA R AREF AREF Output Resistance 110 Ω ADC output AIN[7:0] can be read from address 0CH after startup time. Overflow bit can be read from bit D7 in address 0BH. The overflow bit indicates that input voltage exceeds the input voltage range of the ADC. The ADC output value in this case is FFH. When averaging is on, the overflow is high, if any of the 64 conversion results in the averaging period overflows. Thus the averaged result may be considerably below maximum and the overflow can still be high, if the input signal is noisy. Examples for optical sensor are photodiode SHF2400 and phototransistor SFH3410 from Osram or BSC 3216 G1 optical sensor from TDK. ADC can be used for temperature measurement with a thermistor. It enables temperature compensated LED driving. If ADC is not used, it should be disabled by writing en_ambadc bit low. AIN and AREF pins can be left unconnected www.national.com 11 |
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