Datasheet

BATT

TERM

FAULT

TS-CTRL

240 ms

bq51013B

SLUSB62A –MARCH 2013–REVISED OCTOBER 2013

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Figure 39. Timing Diagram for TS Detection Circuit

3-state Driver Recommendations for the TS-CTRL Pin

The TS-CTRL pin offers three functions with one 3-state driver interface

1. NTC temperature monitoring,

2. Fault indication,

3. Charge done indication

A 3-state driver can be implemented with the circuit in Figure 40 and the use of two GPIO connections.

Figure 40. 3-state Driver for TS-CTRL

Note that the signals “TERM” and “FAULT” are given by two GPIOs. The truth table for this circuit is found in

Table 6:

Table 6.

TERM FAULT F (Result)

1 0 Z (Normal Mode)

0 0 Charge Complete

1 1 System Fault

The default setting is TERM = 1 and FAULT = 0. In this condition, the TS-CTRL net is high impedance (hi-z) and;

therefore, the NTC is function is allowed to operate. When the TS-CTRL pin is pulled to GND by setting FAULT =

1, the Rx is shutdown with the indication of a fault. When the TS-CTRL pin is pulled to the battery by setting

TERM = 1, the Rx is shutdown with the indication of a charge complete condition. Therefore, the host controller

can indicate whether the Rx is system is turning off due to a fault or due to a charge complete condition.

Thermal Protection

The bq5101xB includes a thermal shutdown protection. If the die temperature reaches T

(OFF), the LDO is shut

off to prevent any further power dissipation. In this case bq51013B will send an EPT message of internal fault

(0x02).

Product Folder Links: bq51013B