BQ26100_15 Datasheet, PDF (20/29 Pages) Texas Instruments – Based Security and Authentication IC

bq26100
SLUS696B – JUNE 2006 – REVISED AUGUST 2015
8 Application and Implementation
www.ti.com
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
A typical application consists of a host microcontroller as the SDQ master and the bq26100 device as the SDQ
slave. The SDQ I/O on the bq26100 device is an open-drain pin and the SDQ master should also be configured
as open-drain to allow a pullup resistor to be connected to a voltage that is between 2.5 V and 5.0 V.
8.2 Typical Application
P+
R1
4.7 kW
SDQ
+
C1
0.1 mF
bq26100
PWR SDQ
VSS
VSS
VSS
VSS
Protector
BAT
VSS
OC
DO
CO
P–
Figure 24. Sample Application
8.2.1 Design Requirements
For this design example, use the parameters listed in Table 8.
Table 8. Design Parameters
DESIGN PARAMETER
Pullup Voltage
Pullup Resistor
EXAMPLE VALUE
2.65 V to 5.0 V
4.7 kΩ
8.2.2 Detailed Design Procedure
The bq26100 device requires a 12-V maximum-pulse signal to program the OTP memory. It is necessary to have
a programming test setup for production. Figure 25 shows an example of what the circuit could be for such a
setup. The Programming Module contains the microcontroller that acts as SDQ master and also controls the time
of the programming pulse and its width. The 12-V supply is the source for the programming pulse. Only SDQ and
VSS signals need to exit the test setup as the Application Circuit containing the bq26100 device under test is
connected only for programming and verifying data.
The Programming Module typically will connect to a PC using an interface such as USB. The diagram in
Figure 25 does not include the interface to a PC, which can vary depending on the system designer's choice.
20
Submit Documentation Feedback
Product Folder Links: bq26100
Copyright © 2006–2015, Texas Instruments Incorporated