DA9155M datasheet(20/38 Pages) RENESAS

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DA9155M

2.5 A Companion Charger for Rapid Charging

Datasheet

Revision 3.2

25-Feb-2022

CFR0011-120-00 Rev 5

20 of 37

SLAVEadr W A

REGadr

DATA

S = START condition

A = Acknowledge (low)

Sr = Repeat START condition

* = No Acknowledge

P = STOP condition

W = Write (low)

R = Read (high)

Master to Slave

Slave to Master

7-bits

1 bit

8-bits

DATA

1-bit

8-bits

DATA

……….

8-bits

Repeated writes

Figure 16: 2-Wire Page Write

Via control WRITE_MODE, a repeated write mode can be enabled. In this mode, the master can

execute back-to-back write operations to non-consecutive addresses. This is achieved by

transmitting register address and data pairs. The data will be stored in the address specified by the

preceding byte. The repeated write mode is illustrated in Figure 17.

SLAVEadr W A

REGadr

DATA

S = START condition

A = Acknowledge (low)

Sr = Repeat START condition

* = No Acknowledge

P = STOP condition

W = Write (low)

R = Read (high)

Master to Slave

Slave to Master

7-bits

1 bit

8-bits

REGadr

1-bit

8-bits

DATA

……….

8-bits

Repeated writes

Figure 17: 2-Wire Repeated Write

If a new START or STOP condition occurs within a message, the bus will return to IDLE-mode.

10.3 Buck Converter

DA9155M features a Buck converter that provides up to 2.5 A of regulated output current, with

IOUT_ACC regulation accuracy.

The output current of the Buck can be selected from a control register (BUCK_IOUT). In order to limit

inrush current from the power supply, the Buck converter features a soft-start function. Whenever the

Buck is enabled or the output current is changed, the output current is ramped to the target value by

running through the BUCK_IOUT steps at a rate defined by the START_SLEW and

DEF_SLEW_RATE registers. As the names imply, START_SLEW is used when the Buck is enabled

and DEF_SLEW_RATE is used when disabling the Buck or changing between IOUT settings. The

slew rate timings are summarized in Table 14.

Table 14: Slew Rate Timings with Different Register Settings

SLEW[2:0]

Time per IOUT Step [µs]

Ramp Rate

[mA/µs]

Ramp Time 250 mA to 2.5 A [µs]

0x5

10.67

0.938

2400

0x6

21.30

0.469

4800

0x7

42.70

0.234

9600

The Buck features a programmable peak current limit (BUCK_ILIM), which protects the pass devices

and the inductor. Hitting the limit triggers an E_BUCK_ILIM event. During normal operation the

E_BUCK_ILIM event should not occur. However, the event can be used as an indication of abnormal

system behaviour.

The Buck is enabled either by writing directly to a control register BUCK_EN or asserting the EN

input. The soft-start feature described above is effective when the Buck is enabled or disabled.

The switching frequency is chosen high enough to allow the use of a small 0.47 µH inductor.

Furthermore, the switching frequency can be adjusted with the BUCK_FSW and OSC_FRQ registers

in order to avoid interference to/from the main charger. The Buck also features an automatic

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