13892 datasheet(91/156 Pages) FREESCALE

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Table 64. Charge Path Regulator Characteristics

Parameter

Condition

Min

Typ

Max

Units

Input Operating Voltage

CHRGRAW

BATTMIN

Output voltage trimming accuracy

VCHRG[2:0] = 011

Charge current 50 mA at T = 25 °C

0.35

Output Voltage Spread

VCHRG[2 :0] = 011, 1xx

Charge current 1.0 to 100 mA

-1.5

1.5

Charge current > 100 mA and above

-3.0

1.5

Current Limit Tolerance(65)

ICHRG[3:0] =0 001

ICHRG[3:0] = 0100

360

400

440

ICHRG[3:0] = 0110

500

560

620

All other settings

Start-up Overshoot

Unloaded

2.0

Configuration

Input Capacitance

CHRGRAW (66)

2.2

μF

Load Capacitor

BPSNS (66)

4.7

μF

Cable Length

(67)

3.0

Notes

65.

Excludes spread and tolerances due to board routing and 100 mOhm sense resistor tolerances.

66.

An additional derating of 35% is allowed.

67.

This condition applies when using an external charger with a 3.0 m long cable.

Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

BATTERY INTERFACE AND CONTROL

OVER-VOLTAGE PROTECTION

In order to protect the application, the voltage at the CHRGRAW pin is monitored. When crossing the threshold, the charge

path regulator will be turned off immediately, by opening M1 and M2, while M3 gets closed. When the over-voltage condition

disappears for longer than the debounce time, charging will resume and previously programmed SPI settings will be reloaded.

An interrupt CHGFAULTI is generated with associated CHGFAULTM mask bit with the CHGFAULTS[1:0] bits set to 01.

In order to ensure immediate protection, the control of M1, M2, and M3 occurs real-time, so asynchronously to the charger

state machine. As a result, for over-voltage conditions of up to 30

μs, the charger state machine may not always end up in the

over-voltage fault state, and therefore an interrupt may not always be generated.

Table 65. Charger Over-voltage Protection Characteristics

Over-voltage Comparator High Voltage Threshold

High to Low, Low to High

Over-voltage Comparator Debounce Time

High to Low

The VBUS pin is also protected against over-voltages. This will occur at much lower levels for CHRGRAW. When a VBUS

over-voltage is detected the internal circuitry of the USB block is disconnected. A USBOVI is generated in this case. For more

details see Connectivity.

When the maximum voltage of the IC is exceeded, damage will occur to the IC and the state of M1 and M2 cannot be

guaranteed. If the user wants to protect against these failure conditions, additional protection will be required.

Parameter

Condition

Min

Typ

Max

Units

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