ZHCSAX2F July 2012 – June 2017
PRODUCTION DATA.
| Pin | I/O | DESCRIPTION | ||
|---|---|---|---|---|
| NAME | DSBGA | VQFN | ||
| AC1 | B3, B4 | 2 | I | Input power from receiver coil. |
| AC2 | B1, B2 | 19 | I | Input power from receiver coil. |
| AD | G4 | 9 | I | If AD functionality is used, connect this pin to the wired adapter input. When VAD-Pres is applied to this pin wireless charging is disabled and AD_ENn is driven low. Connect a 1-µF capacitor from AD to PGND. If unused, the capacitor is not required and AD should be connected directly to PGND. |
| AD-EN | F3 | 8 | O | Push-pull driver for external PFET when wired charging is active. Float if not used. |
| BAT | D1 | 4 | O | Output pin, delivers power to the battery while applying the internal charger profile. |
| D2 | ||||
| D3 | ||||
| D4 | ||||
| BOOT1 | C4 | 3 | O | Bootstrap capacitors for driving the high-side FETs of the synchronous rectifier. Connect a 10-nF ceramic capacitor from BOOT1 to AC1 and from BOOT2 to AC2. |
| BOOT2 | C1 | 17 | O | |
| CHG | F4 | 7 | O | Open-drain output – active when BAT is enabled. Float if not used. |
| CLAMP1 | E3 | 5 | O | Open-drain FETs which are used for a non-power dissipative overvoltage AC clamp protection. When the RECT voltage goes above 15 V, both switches will be turned on and the capacitors will act as a low impedance to protect the device from damage. If used, capacitors are used to connect CLAMP1 to AC1 and CLAMP2 to AC2. Recommended connections are 0.47-µF capacitors. |
| CLAMP2 | E2 | 16 | O | |
| COMM1 | E4 | 6 | O | Open-drain outputs used to communicate with primary by varying reflected impedance. Connect a capacitor from COMM1 to AC1 and a capacitor from COMM2 to AC2 for capacitive load modulation. For resistive modulation connect COMM1 and COMM2 to RECT through a single resistor. See Communication Modulator for more information. |
| COMM2 | E1 | 15 | O | |
| EN2 | G2 | 11 | I | Used to set priority between wireless power and wired power. EN2 low enables wired charging source if AD input voltage is present. EN2 high disables wired charging source and wireless power is enabled if present. |
| FOD | F2 | 14 | I | Input for the rectified power measurement. See WPC v1.2 Compatibility for details. |
| ILIM | G1 | 12 | I/O | Programming pin for the battery charge current. The total resistance from ILIM to PGND (RILIM) sets the charge current. Figure 32 shows RILIM to be R1 + RFOD. Details can be found in Electrical Characteristics and Battery Charge Current Setting Calculations. |
| PGND | A1 | 1, 20 | – | Power ground |
| A2 | ||||
| A3 | ||||
| A4 | ||||
| RECT | C2, C3 | 18 | O | Filter capacitor for the internal synchronous rectifier. Connect a ceramic capacitor to PGND. Depending on the power levels, the value may be from 4.7 μF to 22 μF. |
| TERM | G3 | 10 | I | Input that is used to set the termination threshold. Termination current is the battery current level below which the charge process will cease. The termination current is set as a percentage of the charge current. See Battery Charge Current Setting Calculations for more details. |
| TS/CTRL | F1 | 13 | I | Temperature Sense (TS) and Control (CTRL) pin functionality. For the TS functionality connect TS/CTRL to ground through a Negative Temperature Coefficient (NTC) resistor. If an NTC function is not desired, connect to PGND with a 10-kΩ resistor. As a CTRL pin pull low to send end power transfer (EPT) fault to the transmitter or pull up to an internal rail to send EPT termination to the transmitter. See Internal Temperature Sense (TS Function of the TS/CTRL Pin) for more details. |
| — | — | PAD | — | The exposed thermal pad should be connected to ground (PGND). |