AXP152

The AXP152 is the PMIC (Power Management IC) developed by X-Powers, a sister company of Allwinner.

Overview

AXP152 is a highly integrated power management IC that provides easy and flexible power solution for applications that require multi-rail outputs. It has fully met the increasingly complex needs of application processors on accurate power control.

AXP152 integrates an adaptive and USB-compatible PWM charger, four step-down converters (Buck DC-DC converter), seven low dropout regulators. It also Featuress protection circuitry such as over/under-voltage protection (OVP/UVP), over-temperature protection, and over-current protection (OCP) to guarantee the power system security and stability.

In addition, AXP152 includes a Two Wire Serial Interface (TWSI), through which the application processor is capable of enabling/disabling some power outputs, programming the voltage to decrease the power consumption, and provides customers with unprecedented experience of power management.

AXP152 is available in an 5mm x 5mm 40-pin QFN package.

Pinout Diagram

Features

• 4*Buck DC-DC Converters

• DC-DC1：PFM/PWM mode,scaling in 1.7-3.5V,50mV/step，Output current 1A
• DC-DC2：PFM/PWM mode,scaling in 0.7-2.275V,25mV/step,Output current 2A, DVM
• DC-DC3：PFM/PWM mode,scaling in 1.7-3.5V,50mV/step,Output current 1.2A
• DC-DC4：PFM/PWM mode,scaling in 1.7-3.5V,25mV/step,Output current 1.2A

• System Management

• Support software shutdown or hardware power off
• External wakeup source
• Output monitor
• PWROK signal for reset or power off
• OVP/UVP
• Programable power on voltage or sequence

• 7 LDOs

• LDO0：Output current 1.5A,Internal 500/900/1500mA current limited option
• RTCLDO：On for RTC31,Output 3.1V, One for RTC13,Output 1.3/1.8V
• ALDO1：Analog LDO,scaling in 1.2-3.3V, 300mA
• ALDO2：Analog LDO,scaling in 1.2-3.3V, 300mA
• DLDO1：Digtal LDO or Switch,scaling in 0.7-3.5V,100mV/step,300mA
• DLDO2：Digtal LDO or Switch,scaling in 0.7-3.5V,100mV/step,300mA
• GPIOLDO：Low noise LDO, scaling in 0.7-3.5V,100mV/step,30mA

• Host Interface

• Programable Interrupt and wakeup management
• Multi-function Pins
• Internal Timer

Typical Usage

AXP 152 usage with single or no battery

AXP 152 usage with another PMU (usually with multi-cell battery)

Pinout List

Number	Pin Name	Type	Control Criteria	Description
1	GPIO1	IO	Reg 91h [2:0]	GPIO1
2	PWRON	I		Power On-Off key (PEK) input, Internal 100kΩ pull-up resistor to APS
3	DC3SET	I		Set the default output voltage for DC-DC3
4	VIN2	PI		DC-DC2 Input Source
5	LX2	IO		DC-DC2 Inductor
6	PGND2	G		DC-DC2 NMOS ground
7	DCDC2	I		DC-DC2 Feedback
8	DLDO1	O		DLDO1 Output
9	DLDO2	O		DLDO2 Output
10	DLDOIN	PI		DLDO Input Source
11	DCDC3	I		DC-DC3 Feedback
12	VIN3	PI		DC-DC3 Input Source
13	LX3	IO		DC-DC3 Inductor
14	PGND3	G		DC-DC3 NMOS ground
15	VINT	PO		Internal logic power, 2.5V
16	N_RSTO	O		Output enable signal for external power module
17	RTC13	O		RTC power output for host RTC block
18	RTC31	IO		RTC power output or input for host RTC block
19	ALDOIN	PI		Power supply for analog and ALDO1/2
20	VREF	I		Internal reference voltage
21	ALDO2	O		ALDO2 Output
22	ALDO1	O		ALDO1 Output
23	PWREN	IO	Reg 93h [2:0]	Enable input for some power module, can be configured for GPIO3 (REG93 [3:0])
24	GPIO2	IO	Reg 92h [2:0]	GPIO2 / SYSEN
25	DCDC4	I		DC-DC4 Feedback
26	PGND4	G		DC-DC4 NMOS ground
27	LX4	IO		DC-DC4 Inductor
28	VIN4	PI		DC-DC4 Input Source
29	LDO0IN	PI		LDO0 Input Source
30	LDO0EN	I		LDO0 Enable Input
31	IRQ	IO		IRQ output
32	LDO0	PO		LDO0 Output
33	PWROK	O		Power good indicator
34	SDA	IO		Serial interface data pin. Normally pulled-up to 3.3V by 2.2k resistor
35	SCK	I		Serial interface clock pin. Normally pulled-up to 3.3V by 2.2k resistor
36	PGND1	G		DC-DC1 NMOS ground
37	LX1	IO		DC-DC1 Inductor
38	VIN1	PI		DC-DC1 Input Source
39	DCDC1	I		DC-DC1 Feedback
40	GPIO0	IO	Reg 90h [2:0]	GPIO0
41	EP (GND)	G		Exposed Pad, need to connect to ground

Functional Diagram

Control and Operation

Regulators

This section corresponds to section 9.2 in the datasheet.

The AXP152 features 4 DC-DC step-down (buck) converters, and 7 linear regulators. The DC-DC converters operate in automatic (PFM + PWM) or PWM mode, controllable via reg 80h, at a default frequency of 2.25 MHz. The frequency is controlled via reg 37h. It also supports spread spectrum.

Output	Type	Voltage Range	Default Voltage	Enable steps	Example Usage	Maximum Output	Note
DCDC1	Buck	1.7 - 3.5 V	Configurable	1	3.3V I/O	1000 mA
DCDC2	Buck	0.7 - 2.275 V	Configurable	1	1.25V core	2000 mA
DCDC3	Buck	0.7 - 3.5 V	Configurable	1	1.5V DDR	1200 mA
DCDC4	Buck	0.7 - 3.5 V	Configurable	1	1.25V CPU	1200 mA
RTC-LDO	LDO	Fixed	3.1/1.3/1.8 V	1	RTC	30 mA	Always on
LDO0	LDO	0.7 - 3.3 V	Off	Off	N/A	1500 mA	Can be used for current limiting
ALDO1	LDO	0.7 - 3.3 V	Off	Off	N/A	300 mA	Low noise
ALDO2	LDO	0.7 - 3.3 V	1.8 V	1	N/A	300 mA	Low noise
DLDO1	LDO	0.7 - 3.3 V	Off	Off	N/A	300 mA
DLDO2	LDO	0.7 - 3.3 V	Off	Off	N/A	300 mA
LDOIO0	LDO	0.7 - 3.3 V	Off	Off	N/A	20 mA	Low noise, output on GPIO0

Interrupts

This section corresponds to section 9.6 in the datasheet.

The AXP221 pulls the IRQ pin low to signal an interrupt to the host, and stores the interrupt status in the interrupt status registers (48h ~ 4Ch). Writing 1 to the corresponding bit clears the interrupt. When there are no interrupts, the IRQ pin is pulled up (by an external 51KΩ resistor). Each interrupt can be masked via the interrupt control registers (40h ~ 44h).

Register Address
Control	Status	Bit	Interrupt #	Description	Notes
40h	48h	[7]
40h	48h	[6]	IRQ 1	LDO0IN connected
40h	48h	[5]	IRQ 2	LDO0IN removed
40h	48h	[4]
40h	48h	[3]	IRQ 3	ALDO0IN connected
40h	48h	[2]	IRQ 4	ALDO0IN removed
40h	48h	[1]
40h	48h	[0]
41h	49h	[7]
41h	49h	[6]
41h	49h	[5]	IRQ 5	DC-DC1 output voltage lower than 90%
41h	49h	[4]	IRQ 6	DC-DC2 output voltage lower than 90%
41h	49h	[3]	IRQ 7	DC-DC3 output voltage lower than 90%
41h	49h	[2]	IRQ 8	DC-DC4 output voltage lower than 90%
41h	49h	[1]	IRQ 9	PEK short press	See reg 36h
41h	49h	[0]	IRQ 10	PEK long press	See reg 36h
42h	4Ah	[7]	IRQ 11	Timer expired	See reg 8Ah
42h	4Ah	[6]	IRQ 12	PEK rising edge
42h	4Ah	[5]	IRQ 13	PEK falling edge
42h	4Ah	[4]
42h	4Ah	[3]	IRQ 14	GPIO 0 edge trigger	See reg 90h
42h	4Ah	[2]	IRQ 15	GPIO 1 edge trigger	See reg 91h
42h	4Ah	[1]	IRQ 16	GPIO 2 (SYSEN) edge trigger	See reg 92h
42h	4Ah	[0]	IRQ 17	GPIO 3 (PWREN) edge trigger	See reg 93h

Registers

Power Control

REG 01H: Power operating mode and charge status indication

Bit	Description	R/W
7-6	Reserved	R
5	LDO0IN status when LDO0EN pin is high 0: LDO0IN not present (< 3.5V); 1: LDO0IN present (> 3.8V)	R
4	TWI interface enabled (SIEN pin)	R
3	IRQ pin triggered power on	R
2	PWRON button triggered power on	R
1	Reserved	R
0	ALDOIN rising edge triggered power on	R

REG 12H: Power output control

Bit	Description	R/W	Default Value
7	DC-DC1 on/off	RW	OTP
6	DC-DC2 on/off	RW	OTP
5	DC-DC3 on/off	RW	OTP
4	DC-DC4 on/off	RW	OTP
3	ALDO1 on/off	RW	OTP
2	ALDO2 on/off	RW	OTP
1	DLDO1 on/off	RW	OTP
0	DLDO2 on/off	RW	OTP

REG 13H: ALDO1/2 operation mode control

Bit	Description	R/W	Default Value
7-4	none
3	ALDO1 operation mode 0: low noise; 1: low power	RW	0
2	ALDO2 operation mode 0: low noise; 1: low power	RW	0
1-0	Reserved	RW	00

REG 15H: LDO0 control

Bit	Description	R/W	Default Value
7	LDO0 on/off no effect if LDO0EN is connected to LDO0IN	RW	0
6	Reserved	RW	0
5-4	LDO0 voltage 00: 5V ; 01: 3.3V 10: 2.8V ; 11: 2.5V	RW	00
3-2	Reserved	RW	00
1-0	LDO0 current limit 00: no limit 01: 1500mA 10: 900mA 11: 500mA	RW	00

Reg 23h: DC-DC2 output voltage

Bit	Description	R/W	Default Value
7-6	Reserved
5-0	0.7 - 2.275 V, 25 mV/step	RW	OTP

Reg 25h: DC-DC 2 Voltage Ramp Control

Bit	Description	R/W	Default Value
7-4	None
3	Reserved	RW	0
2	DC-DC2 VRC enable	RW	0
1	Reserved	RW	0
0	DC-DC2 voltage ramp rate 0: 25mV/15.625μs = 1.6mV/μs 1: 25mV/31.250μs = 0.8mV/μs	RW	0

Reg 26h: DC-DC1 output voltage

Bit	Description	R/W	Default Value
7-4	None
3-0	0000: 1.7V 0001: 1.8V 0010: 1.9V 0011: 2.0V 0100: 2.1V 0101: 2.4V 0110: 2.5V 0111: 2.6V 1000: 2.7V 1001: 2.8V 1010: 3.0V 1011: 3.1V 1100: 3.2V 1101: 3.3V 1110: 3.4V 1111: 3.5V	RW	OTP

Reg 27h: DC-DC3 output voltage

Bit	Description	R/W	Default Value
7-6	Reserved	RW	00
5-0	0.7 - 3.5 V, 50 mV/step	RW	OTP & DC3SET pin

Reg 28h: ALDO1/2 output voltage

Bit	Description	R/W	Default Value
7-4	ALDO1 output voltage 0000: 1.2V 0001: 1.3V 0010: 1.4V 0011: 1.5V 0100: 1.6V 0101: 1.7V 0110: 1.8V 0111: 1.9V 1000: 2.0V 1001: 2.5V 1010: 2.7V 1011: 2.8V 1100: 3.0V 1101: 3.1V 1110: 3.2V 1111: 3.3V	RW	OTP
3-0	ALDO2 output voltage 0000: 1.2V 0001: 1.3V 0010: 1.4V 0011: 1.5V 0100: 1.6V 0101: 1.7V 0110: 1.8V 0111: 1.9V 1000: 2.0V 1001: 2.5V 1010: 2.7V 1011: 2.8V 1100: 3.0V 1101: 3.1V 1110: 3.2V 1111: 3.3V	RW	OTP

Reg 29h: DLDO1 voltage control

Bit	Description	R/W	Default Value
7	DLDO1 mode 0: LDO mode, voltage controlled by bits [4:0] 1: Switch mode, voltage close to DLDOIN	RW	0
6-5	Reserved	RW	00
4-0	0.7 - 3.3 V, 100 mV/step	RW	OTP

Reg 2Ah: DLDO2 voltage control

Bit	Description	R/W	Default Value
7	DLDO2 mode 0: LDO mode, voltage controlled by bits [4:0] 1: Switch mode, voltage close to DLDOIN	RW	0
6-5	Reserved	RW	00
4-0	0.7 - 3.3 V, 100 mV/step	RW	OTP

Reg 2Bh: DC-DC4 output voltage

Bit	Description	R/W	Default Value
7	Reserved	RW	0
6-0	0.7 - 3.5 V, 25 mV/step	RW	OTP

Reg 31h: Power recovery and V_OFF control

Bit	Description	R/W	Default Value
7	Pull down PWROK when power recovers 0: Don't pull down PWROK 1: Pull down PWROK during wakeup	RW	0
6-4	Reserved	RW	000
3	Power recovery enable	0: Not enabled; 1: Enabled; Auto-cleared	RW	0
2-0	VOFF voltage: 2.6 - 3.3V, 100 mV/step	RW	111

REG 32h: Shutdown control

Bit	Description	R/W	Default Value
7	Shutdown; Writing 1 turns off AXP152; auto-cleared	RW	0
6-3	Reserved	RW	0000
2	Output power off sequence 0: Turn off all outputs at the same time 1: Reverse of power on sequence	RW	0
1-0	Reserved	RW	00

REG 36h: PEK button parameters

Bit	Description	R/W	Default Value
7-6	Power on timing 00: 128ms; 01: 3s; 10: 1s; 11: 2s	RW	10
5-4	Long press timing T = [ 1 + (bit 1-0) * 0.5 ] S; default: 1.5S	RW	01
3	Automatic shutdown when pressed longer than Tshutdown	RW	1
2	PWROK delay after power on 0: 8ms ; 1: 64ms	RW	1
1-0	Tshutdown = [ 4 + (bit 1-0) * 2 ] s; default: 6s	RW	01

Reg 37h: DC-DC operating frequency

Default value: 08h

Bit	Description	R/W	Default Value
7	Enable spread spectrum for DC-DC	RW	0
6	DC-DC spread spectrum bandwidth 0: 50 KHz; 1: 100KHz	RW	0
5-4	reserved	RW	00
3-0	DC-DC switching frequency F = [1 + / - (Bit3-0) * 5%)] * 2.25MHz	RW	1000

REG 80h: DC-DC operation mode

Bit	Description	Value	R/W	Default Value
7-4	Reserved		RW	0000
3	DC-DC1 operation mode	0: PFM+PWM 1: PWM	RW	0
2	DC-DC2 operation mode		RW	0
1	DC-DC3 operation mode		RW	0
0	DC-DC4 operation mode		RW	0

GPIO controls

REG 90H: GPIO0 control

Bit	Description	Values	R/W	Default Value
7	Enable GPIO0 rising edge IRQ/wakeup	1 to enable	RW	0
6	Enable GPIO0 falling edge IRQ/wakeup	1 to enable	RW	0
5-3	Reserved
2-0	GPIO0 pin function	000: output low 001: output high (DC-DC1) 010: PWM0 output (DC-DC1) 011: input 1XX: floating	RW	111

REG 91H: GPIO1 control

Bit	Description	Values	R/W	Default Value
7	Enable GPIO1 rising edge IRQ/wakeup	1 to enable	RW	0
6	Enable GPIO1 falling edge IRQ/wakeup	1 to enable	RW	0
5-3	Reserved
2-0	GPIO1 pin function	000: output low 001: output high (DC-DC1) 010: PWM1 output (DC-DC1) 011: input 1XX: floating	RW	111

REG 92H: GPIO2 (SYSEN) control

Bit	Description	Values	R/W	Default Value
7	Enable GPIO2 rising edge IRQ/wakeup	1 to enable	RW	0
6	Enable GPIO2 falling edge IRQ/wakeup	1 to enable	RW	0
5-3	Reserved
2-0	GPIO1 pin function	000: output low 001: floating 010: low noise LDO 011: input 1XX: floating	RW	111

REG 93H: GPIO3 (PWREN) control

Bit	Description	Values	R/W	Default Value
7	Enable GPIO3 rising edge IRQ/wakeup	1 to enable	RW	0
6	Enable GPIO3 falling edge IRQ/wakeup	1 to enable	RW	0
5-3	Reserved
2	GPIO1 pin function	000: output low 001: floating 010: floating 011: input 1XX: floating	RW	111

REG 96h: GPIO2 LDO voltage control

Bit	Description	Values	R/W	Default Value
7-4	Reserved
3-0	GPIO2 LDO output voltage	Vout = 1.8 + 0.1 * (Bit 3-0) V	RW	1010

REG 97h: GPIO [3:0] input

Bit	Description	Values	R/W
7-4	Reserved
3	GPIO 3 input value		R
2	GPIO 2 input value		R
1	GPIO 1 input value		R
0	GPIO 0 input value		R

REG 98h: PWM0 frequency control X0

Bit	Description	Values	R/W
7-0	PWM0 frequency (X0)	0 ~ 255	RW

PWM0 frequency = 2.25 MHz / (X0 + 1) / Y0

REG 99h: PWM0 frequency / duty cycle control Y0

Bit	Description	Values	R/W
7-0	PWM0 frequency / duty cycle (Y0)	0 ~ 255	RW

REG 9Ah: PWM0 duty cycle control Z0

Bit	Description	Values	R/W
7-0	PWM0 duty cycle (Z0)	0 ~ Y0	RW

PWM0 duty cycle = Z0 / Y0

REG 9Bh: PWM1 frequency control X1

Bit	Description	Values	R/W
7-0	PWM1 frequency (X1)	0 ~ 255	RW

PWM1 frequency = 2.25 MHz / (X1 + 1) / Y1

REG 9Ch: PWM1 frequency / duty cycle control Y0

Bit	Description	Values	R/W
7-0	PWM1 frequency / duty cycle (Y1)	0 ~ 255	RW

REG 9Dh: PWM1 duty cycle control Z1

Bit	Description	Values	R/W
7-0	PWM1 duty cycle (Z1)	0 ~ Y1	RW

PWM1 duty cycle = Z1 / Y1

Interrupts

See Interrupts section.

Spec Sheets

AXP152 Datasheet v1.0 (PDF, 34 pages, 2012-04-01)

See Also

• AXP209
• AXP221