SM72442 Datasheet, PDF (4/14 Pages) National Semiconductor (TI) – Programmable Maximum Power Point Tracking Controller for Photovoltaic Solar Panels

Pin Descriptions
Pin Name Description
1
RST Active low signal. External reset input signal to the digital circuit.
2
NC1 Reserved for test only. This pin should be grounded.
3
VDDD Digital supply voltage. This pin should be connected to a 5V supply, and bypassed to VSSD with a 0.1 µF monolithic
ceramic capacitor.
4
VSSD Digital ground. The ground return for the digital supply and signals.
5
NC2 No Connect. This pin should be pulled up to the 5V supply using 10k resistor.
6
I2C0 Addressing for I2C communication.
7
I2C1 Addressing for I2C communication.
8
SCL I2C clock.
9
SDA I2C data.
10
NC3 Reserved for test only. This pin should be grounded.
11 PM_OUT When Panel Mode is active, this pin will output a 400 kHz square wave signal with amplitude of 5V. Otherwise, it
stays low.
12 VDDA Analog supply voltage. This voltage is also used as the reference voltage. This pin should be connected to a 5V
supply, and bypassed to VSSA with a 1 µF and 0.1 µF monolithic ceramic capacitor.
13
VSSA Analog ground. The ground return for the analog supply and signals.
14
A0 A/D Input Channel 0. Connect a resistor divider to 5V supply to set the maximum output voltage. Please refer to
the application section for more information on setting the resistor value.
15
AVIN Input voltage sensing pin.
16
A2 A/D Input Channel 2. Connect a resistor divider to a 5V supply to set the condition to enter and exit Panel Mode
(PM). Refer to configurable modes for SM72442 in the application section.
17 AVOUT Output voltage sensing pin.
18
A4 A/D Input Channel 4. Connect a resistor divider to a 5V supply to set the maximum output current. Please refer to
the application section for more information on setting the resistor value.
19
AIIN Input current sensing pin.
20
A6 A/D Input Channel 6. Connect a resistor divider to a 5V supply to set the output voltage slew rate and various PM
configurations. Refer to configurable modes for SM72442 in the application section.
21 AIOUT Output current sensing pin.
22
I2C2 Addressing for I2C communication.
23
NC4 No Connect. This pin should be connected with 60.4k pull-up resistor to 5V.
24
LIB Low side boost PWM output.
25
HIB High side boost PWM output.
26
HIA High side buck PWM output.
27
LIA Low side buck PWM output.
28
PM Panel Mode Pin. Active low. Pulling this pin low will force the chip into Panel Mode.
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