BQ27210 Datasheet, PDF (25/30 Pages) Texas Instruments – Li-Ion AND Li-Pol BATTERY GAS GAUGE IC FOR PORTABLE APPLICATIONS (bqJUNIOR)

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Host enables E2PROM
programming mode. Write data
0xDD to address 0x6E
Host writes data in addresses
0x76 − 0x7F
bq27010, bq27210
SLUS707B – APRIL 2006 – REVISED JANUARY 2007
Host reads data
address 0x76
21−V pulse applied to
PROG pin for 50 ms
Programmed
0x7F?
Host increments
address and reads
No
Yes
Write data 0x00 to
address 0x6E
UDG−04099
Figure 6. EEPROM Programming Flow
It is not required that addresses 0x76 — 0x7F be programmed at the same time or in any particular order. The
programming method illustrated in Figure 6 can be used to program any of the bytes as long as the sequence of
Enable, Write, Read, Apply Programming Pulse, and Disable is followed.
The bqJUNIOR must have a full reset to force the updated EEPROM values into RAM. A full reset will occur
after a POR if RAM data is corrupted (failed checksum), or a full-reset command may be sent using the CTRL
and MODE registers.
Communicating With the bq27010 (HDQ interface)
The bq27010 includes a single-wire HDQ serial data interface. Host processors, configured for either polled or
interrupt processing, can use the interface to access various bq27010 registers. The HDQ pin is an open-drain
device, which requires an external pullup resistor. The interface uses a command-based protocol, where the
host processor sends a command byte to the bq27010. The command directs the bq27010 either to store the
next eight bits of data received to a register specified by the command byte or to output the eight bits of data
from a register specified by the command byte.
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