DS2436 Dallas Semiconducotr, DS2436 Datasheet - Page 24

• Manufacturer Part Number: DS2436
• Description: Battery ID/Monitor Chip
• Manufacturer: Dallas Semiconducotr

Read Time Slots
The host generates read time slots when data is to be read from the DS2436. A read time slot is initiated
when the host pulls the data line from a logic high level to logic low level. The data line must remain at a
low logic level for a minimum of 1 s; output data from the DS2436 is then valid for the next 14 s
maximum. The host therefore must stop driving the I/O pin low in order to read its state 15 s from the
start of the read slot (see Figure 9). By the end of the read time slot, the I/O pin will pull back high via the
external pullup resistor. All read time slots must be a minimum of 60 s in duration with a minimum
recovery time of 1 s between individual read slots.
Figure 10 shows that the sum of T
system timing margin is maximized by keeping T
master sample time towards the end of the 15 s period.
INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 8
LINE TYPE LEGEND:
Bus master active low
Both bus master and
DS2436 active low
INIT
, T
RC
, and T
24 of 29
INIT
SAMPLE
and T
must be less than 15 s. Figure 11 shows that
RC
as small as possible and by locating the
DS2436 active low
Resistor pullup
DS2436